Hi there

I'm quite new to this all, too, but I can share some stuff I have found useful.
When I decided I need to just start living as me and not hide behind the girl role I had, I started slowly getting more androgynous clothing. I found leather jackets to be very useful for hiding the female parts

and soon started wearing mostly collar shirts and loose, dark jeans. At the same time bright colors started to make way for black and cold colored clothes, though dunno how much help that is. That was about 1,5 years ago.
Basically I just went with what was most comfortable for me. I even thought I didn't have dysphoria about wearing clothes that are shaped for a female, but after trying on men's clothes for real, I understood how much anxiety the clothes I had gave me. Nowadays I just feel I can't go back to living in that awkwardness, I'd rather look like crap and without style in boys clothes than have clothes that show off a curve.

I'd recommend window-shopping at a boy's department (men's S size is usually too big for me, boy's clothes have much more fitting sizes...) and trying everything interesting out, and then buying similar ones from thrift stores if money is a problem. I buy almost no clothes new.
Besides clothes, I found exercise to be very useful. Especially upper body and stomach (since I used to despise how feminine and soft my stomach was). And running did miracles to the lower body, I got much thinner on the hips.
The last important thing I've done so far was cutting my hair short about 3 months ago. My long, red and curly hair was the one thing I thought screamed girl in me, and I was strongly attached to it because I thought it made me "pass" as a girl, and not seem so fake. Strange, I now... But now it's sort of short and I look much more androgynous. Maybe more on the glam rock / alternative rock side of things, but still.

I do want partly long hair when I pass more as a boy, though. About style in general, if you're not looking for blending in, the goth/punk/glamrock/japanese music scenes have lots of androgynous people and can be great examples. They definitely were for me.
Hopefully some of this stuff is useful to you, too ^^ Oh, and of course, binding was the first big change I did, and emotionally one of the most important.

I started out with practically anything that bound but didn't hurt, then moved on to one sport bra, then two tight ones, then at last a real binder. The next step will definitely be a tighter real binder