Do you want to learn a trade like plumbing, electricity, or HVAC? The hours are going to be sporadic, but you have a lot of potential there not just in your hourly wage, but in owning a small business / working for yourself.
If you like computers, there are a lot of free resources out there to teach you how to code -- "Learning Python the Hard Way" is a good place to start. Python is an easy language to learn (so I've been told) and a lot of programmers use it. It's another area where you could work for a company or freelance / own your own business.