I am 26 and on disability. I am slowly working my way up to being independent and self-suficient but it's been a really hard long struggle. Two years ago all I did every day was lay in bed, two years before that I took my boyfriend's parent's car across country on short notice and got in an accident and was just acting wrecklessly. Before that was college, which I bombed and couldn't handle. Throughout it all was various mood episodes.
So, now I'm trying school part-time and working part-time, which is very very difficult. I'm working about 15 hours a week [at times less] and this semester I'm going to try two classes. We'll see how it all goes. It's been hard to get even here. Harder than I thought it would be.

Anyway, enough about me.
I would suggest focusing on getting disability and getting stable and staying stable for a while. Then, see if you can volunteer some place a couple times a week.
If that works out, contact vocational rehabilitation and use your Ticket to Work [which is a program that is part of disability] to get involved in a work program. That is how I am going to school. Through a work training program with vocational rehabilitation.
Start with something part-time then move on from there.
I just would suggest you go slow because you want to make sure you're successful, ya know? And it can be surprisingly jarring sometimes when you start working again.

Sorry if I sound preachy or anything like that.