You are probably terrified right now, though possibly no more the you usually are, but this could be the first day of the rest of your life 
You CAN absolutely do this. You CAN have the life you deserve and want.
Who cares if you don't know how to do some things? You can always ask, either in rl or here. I think it's very easy when you've got a mental health issue to see everyone else as perfect and coping and doing well, but that's simply not the case. The amount of parents I speak to who are exactly like me in the fact that they have no idea what they're doing when it comes to parenting is huge!
My sil has major issues talking to people on the phone. She can barely do it, and I empathise because I felt similarly a few years ago--so much so that I was adamant I couldn't get a job, so I didn't even bother trying, despite having a degree! Nobody is perfect, we all make mistakes, there are always things we don't know how to do, so please, please don't let this hold you back.
Reading your posts you sound like a shell of a person at the moment. He's worn you down and hollowed you out, but you have the power to fill yourself back in again. I promise you do.
You can do this, and we're all behind you 