Welcome! You will love this site and if you check in often it helps to keep you focused. You can do this, one day at a time.
It is overwhelming just getting started but it will get better!
It sounds like you have been through a lot, and I'm sure being a mom (we can all relate)that you have put yourself on the back burner for many years. Just remember you are much more valuable to everyone in your life if you are healthy.
So take good care of yourself and know that there are many helping hands here. Good Luck!