You will not like this answer, in fact no one will, but fu*k it.
Heres what i/my friends do:
1- Minimum wage job- I bag groceries, hey it gets me some cash to do my other shi*, this is my legit job.
2- Deal drugs- u wanted honesty, You can pull 200-250 a day if i work at dealin. IM NOT TELLING YOU TO DO IT, so dont take it the wrong way. But i know people who make madd cash doin this, but it is a non-legit job.
3- Steal bikes, strip em, sell the parts- Cant make much here, but i got friends who do it and got some cash, so its an option.
4- Jump freshman for cash- Classic cash makin scheme
IF u dont wanna break the law, your pretty much stuck with minimum wage jobs.