Well, since you haven’t left your husband, even if you’re on good terms, I suggest having your own high yield savings account that you put your own savings into.
But, realistically, you’ll work the job you have, slowly work towards a bachelor degree at night or whatever if that’s what you want, get promoted at your current job, build back up your skills and resume in the workforce. If you leave before you’re self sufficient, you would probably need to get some financial aid if you end up being below the poverty line. And all those things would change depending on if you take your kids or what. Just keep working towards your dream. You can’t predict the future, so just take it one step at a time.