<tough love auntie Tori time>
Hmmmm....
Well, this all depends on how able to be a parent you feel like you have the ability to be at the moment.
Frankly, you seem a mess. I know that's harsh but really, you do. It may be for the best if you get out of the toxic situation that you're in, get a LOT of therapy (feeling yourself as evil = no bueno), and do what you can to support your kids while going through your stuff. If your wife is really against you transitioning and you feel with 100% certainty that you need to, there's no bridge across that gap. It's over. You're just delaying the inevitable. I leave it up to you to decide whether it is or not.
If you have no friends and no support network (you probably do but I know what you're feeling), transition is a horrible, painful experience that doesn't really leave you in a much better place than you were in before BUT if your current environment is openly hostile to you, it might be the lesser of two evils.
*siiighs*
You really, really, really need to get your therapy though. This isn't about them. It's about you. If you're this unhappy, the people you surround yourself with aren't the right kinds of people. If that means that your family aren't the right kinds of people, well, that is what it is (I noticed that you didn't say that you'd come out to them). We all lose people when we transition, even the best-case scenarios.
For the short term: clean yourself up thoroughly. If you know without a doubt that you'll want to transition, might I recommend doing a nice bath, shaving/nair-ing (they make the 'for men' stuff that can take off your hair), get a haircut that you like (talk to your stylist or get a gay one, tell them what's up, and let them start shaping your hair to what you want), shave off the facial hair (if your partner is so far gone that she can't take even that, it's over anyway), and start getting yourself feeling better about yourself.
After that, EXERCISE!!! A LOT!!! EVERY DAY!!! (endorphins are your friend)
No crappy food, drink lots of water, sleep your 8-hours.
Take care of YOU!!! You have to feel like you love yourself before you can be open to receiving real love from others.
You're in a crappy place. It sucks. It's totally up to you to get out of it. We'll be here for the cheerleading but you've gotta make some positive changes in your life before starting down transition road anyway or you won't make it out the other side.