Everyone is different. I have heard advice that working 5-15 hours per week your first semester is all you should imagine; and that really should be an on-campus job (since demands ebb and flow with the school calendar, and you are not going to get fired for reducing your hours the week before finals).
You may want to think about the value of your degree in two ways: How fast you can pay back a loan at post-graduation salary versus how much you can earn while a college student at close to minimum wage; and the impact of working on your grades and subsequently on your job opportunities. Working full-time while attending school rarely makes sense from a return-on-investment analysis.
Similarly, with your ACT score, going to a community college may not be a good idea as most merit money is available for four years at the same school beginning freshman year. You may be better off going for a merit scholarship- reread the entire thread- especially #55, 63, and 91.