Aw, man, Izzy. I'm so sorry.
Having been through a divorce myself, this is what I recommend.
Number One Priority: Get the best lawyer you can possibly afford, as fast as you possibly can.
Get your name off of every mutual obligation you have with your wife as fast as you possibly can. This includes bank accounts (which you're already working on) and credit cards in particular, but also things like utility bills. I do not recommend this for home or auto titles until you have spoken with an attorney.
Make a copy of every document and bill you have with your wife. Credit records, bills, Social Security, investment accounts, retirement accounts, the lot. Put the copies in a safe place outside of your mutual home.
Do not leave your child. As a father the courts will unfortunately be slanted against you. Speak to an attorney about custody arrangements before moving out, if at all possible. In the meantime, act like you are a saint. Do not give your wife or the courts even the remotest excuse to deny you custody or visitation.
Do your best not to badmouth your child's mother to your child. Let your child know what has already been said: that this split is not their fault, neither you nor their mother love them any less, and you are there to help them through this as you have always been there to help them through any hard time.
Get counseling if needed, for yourself and your child. If your wife is willing to go to marriage counseling, get that too. If not, there isn't much you can do.
Realize that you are going to run a gamut of emotions over the next year or so, maybe longer. Certainly things are going to be intense in the short run. Try to keep your emotions separate from the business of dissolving your marriage legally, as difficult as it may be. But also do whatever you need to do to take care of your emotions in a healthy way.
Get as much sleep, good food, and support as you can.
And hang in there.
Divorce bites. I'm so sorry. Hugs if you want 'em.
