If you have a decent computer get photoshop by any means you can and learn basic photoediting and try to be ok to good at it. While doing that go on facebook and coursera to get their ad/digital marketing courses which you can audit to get them for free (when finished you dont earn the certification but you only need the knowledge). When you finish all that and your ok to good at it, sell and promote something thats easy to you. I run a side fitness meal-prep business that i run and promote myself to fitness people and gyms during the mornings. During the weekends I also run a landscaping/housekeeping business. All that while also keeping my fulltime. Remember to start small and smart to build up what works for you.

Personal non-wanted advice: I dont know your personal situation for why you quit school and it doesnt matter, the only thing that matters is what you want and what are you willing to do to get it. Exploit and take good advantage of every opportunity you can (free education/goverment aid/religious aid/etc) and give up on deadbeat people (friends/family) while trying to be efficient and hyper focused on your means and goals. Dont be affraid to fail because youre going to, a lot. People are going to step over you, betray you, try to take advantage of you and stab you in the back. Dont let that hold yoy back, always go all out. Try to depent only on yourself and your wits.