Is it a good idea to work part-time?

Posting it here too!

Hi guys, I need some advice... I'm going back to school next week but I'm really not sure if it would be a good idea for me to look for a job while going to school or not. I never had a job before and I'm 21 years old. I'm afraid it will be a big mistake if I do decide to work b/c I'm a business major and I'm going to be in a lot of math related courses(math is not exactly my forte) not to mention my SA makes the whole job search and interviewing process alot more complicated. I know that it will be difficult for me but I feel like I'm wasting time by not getting a job and earning some income, I'm at an age where I should have some experience by now. On one hand, I don't want to risk my GPA dropping but on the other hand, I feel like I'm putting myself behind by not having a job and some sense of independence at my age. Iplan on working MWF from (12:00-4 or 5) if my potential employer would allow. Its now or never for me!!!

Should I wait to find a job or see if a part-time job would work out?