1. No mascara. Unless you're very skilled with it or going for a certain precise style (which won't work in the beginning for sure), that's mostly only appropriate for night outings.
2. As for the rest of make-up... the main thing is that you need to make your facial hair as invisible as you can. If the foundation does it, great. If not, some concealer (be it in a cheap-ish beige lipstick-like thing or a more expensive palette of colours) might do the trick. If your beard shadow has a bluish colour to it, then red can probably offset it. That can be performed with the specialized expensive palettes, but apparently some people have thought of a tip where they spread just a thin layer of red lipstick over their beard area (don't remember, maybe they mixed it with something?) and then spread the foundation over it. If nothing can be done, then there is the last recourse of DermaBlend, an expensive product for hiding scars. Apparently it works wonders.
Then you add powder. Pretty simple. Just brush it around everywhere. It has two purposes. One, it'll help foundation hold better against touch/water/etc. and two, if your foundation, like mine, "looks like make-up", it should give your skin a more natural appearance.
Then... Whatever you do, no blush or even eyeshadow. These products are mainly for night outings, and for day use, they are to be used with utmost precaution and skill, and in very subtle ways. No way a beginner can do that. Even, if you're in the unlucky bunch of beginners, you'll try it and THINK it looks fine, and then go out looking weird. So forget it for now.
And for last... your lips. Don't overdo it. Above everything, no flashy lipstick. How about some subtle, transparent-ish gloss for now?
As a whole, make-up is probably the hardest part of it all. It's easy to screw it up. The more kinds of make-up you add, the more risk you take. On the other hand, not wearing any, or wearing little of it, is no less womanly than wearing a lot of it. If anything it's more normal.
3. Your eyebrows are an extremely important part. They must look at least okay for a woman. And since a mistake hurts for a long time, ask a professional or a skilled friend to do this. It's cheap and should always yield something at least acceptable.
4. Dress... normal. The most normal you can think of for the season. If you want to pass above everything else, no dress. Dresses don't tend to flatter a male-ish figure at all. And to be honest, even though it's "in" right now, and even if you wear a really fashionable dress, dresses are the most easily "weird" kind of clothes. Trans or not. So uhm, yeah, as normal as you can think of.
A capri, a boat-neck t-shirt and something of a feminine-ish open shirt over it sounds like a safe thing to try, for example, if the temperatures are still summer-like. Anyhow, think normality and blending in. If you overly attract attention, people will look at you more and make it more likely that they'll see through you (not literally - I swear you won't become a ghost). And even if they don't, people will look at you and make you afraid that they know what's underneath, which will make you inconfident and stressed, which will also not help you at all.
And mind you, for example, it's not because so many thin women (well mostly girls actually) wear very short shorts that you can put it in the "normal" category. Even if you think your legs are okay. They may be, but at least for your first outing (and actually according to me for your hundred first outings until you're completely confident on every aspect) attracting attention and looks, for good or bad reasons, ends up being bad.
Look up how to dress in an advantageous way for your body shape, remaining within normal bounds. Quickly, I fished you up these, but don't hesitate to google around a bit yourself:
http://www.wikihow.com/Dress-for-Your-Body-Typehttp://feminizationsecrets.com/category/fashion/(I think on this site there were haircut tips too - take a look before buying a wig. Speaking of which, it's probably a lot safer, if you have the courage to do it, to go shop for a wig in person. What if you buy something that looks great on the website but not on you? You can just say you need it for a costume party or something.)
http://www.marksandspencer.com/Dress-your-Bodyshape-Dresses-Womens/b/1892339031If you're tall, too, it might not hurt to look into ways to look shorter.
Oh, and another note, in case you're very oblivious to fashion. Fashion magazines are by far your worst reference when it comes to dressing normal. Fashion designers are eccentrics and love to do everything eccentrically. These articles feel like the bible - enormous metaphors and exaggerations to pass a small message. Except, the bible is a hundred times less cryptic. For example, the last fashion article I read, maybe a year ago, said "this year, red is worn from head to toes - no half measures!" Yes, wear a red hat, blouse, pants, bracelets and shoes and people won't think you're weird, yes. Not to mention, what's "in" right now is hipster clothes. Masculine, "boyfriend" clothes. Not your goal, even if you disagree with me and say it looks good.
5. Your voice is probably more important than all the rest. It must be passable, even if your looks are flawless. And if they're not then your voice must be flawless or close. Unless you don't intend to speak at all.
6. Of course, that's obvious, but you need to take care of your body hair. If you have darker hair that still shows quite a lot through the skin even shaved, then the good news is that laser will probably be effective on it, eventually. The bad news is that you need to pull it out. I recommend wax (not sugar!). It's pretty easy and if you do it like removing a band-aid, it's not so painful, and it becomes near-painless as you get used to it. Arm hair is a question you have to ask yourself: do you have arm hair that's acceptable, within normal borders, for a woman? I don't. Maybe you do.
7. Make sure you don't walk too masculinely. You don't need to especially walk like a woman. Just, not like a man. And make sure you don't overdo it. An overly hip-shaking model walk is, to be nice, very attention-attracting. The most simple thing I can think of is... if, when you walk, your shoulders move a lot alternatively (up and down and/or left and right and/or front and back), then you're walking wrong.
Imagine that old "dignified walking" training where they walk with books on their head. No need for books, but your shoulders (and ultimately head, which follows) shouldn't move much otherwise than up and down simultaneously, to follow your body that goes up and down with your steps. If the shoulders are okay, the rest probably is. As a bonus, the necessary lateral movement, if it's not in your shoulders, should move to your hips. Don't overdo it though. Model-like walking is bad.
The principle behind it all is that men tend to shift their weight strongly from one side to another when walking, the body itself remaining rather stiff and bending from one side to another, while women tend to keep their weight rather centered, the hips bending and absorbing the lateral movement.
Okay, all of the above is rather severe, and you may argue that XYZ thing that will help you pass isn't "you", but that's a choice you have to make. There's no arguing with tastes or personalities, but there sure are things that pass more than others. Whether, when and where you compromise between passability and tastes... only you can decide. Just make sure your liking for something doesn't impede your ability to discern its passability. Personally I recommend going extra safe in the beginning and then adjusting, if needed, to your tastes, as you gain confidence and your body gains feminity.
