Should I get a job?

Well, I am a sixteen year old guy. I've never had any job experience besides that of which I volunteered to work in a concession stand twice. Let's just say I never want to eat nachos again. I am a good student and have a 3.75 GPA. I don't want my job to interfer with my school, and I also don't want it to take too large of a chunk out of my free time. Should I get a job or not? There are some things I really want, and my dad CAN'T pay for it all...