How to start over at 38 with no degree or gainful employment history?

Long story short, I have been on Disability for 13 years and before that I had very limited work experience. In fact, none of my experience was seen as gainful employment. I am on limited Disability, meaning I get SSI instead of SSDI, and I am tired of it. I am tired of struggling to survive and I am tired of being nothing more than a disabled 38-year-old man. The only good thing I did in life is have 2 wonderful sons who mean the world to me. Anyway, I want to get off of SSI soon and to do that I need to start working or furthering my education at the very least. What would be some good careers to look into that won't be turned off by my past? For further clarification, my disability is mostly from my bad back. However, I figure I could try working from home or in an office setting. In 2014, there weren't a whole lot of opportunities for at home work but perhaps now there are.