I was lucky, that my dad helped me with my first few jobs. He needed a drafter, I could draw. He bough the supplies, and got me started (we're talking pen & paper, not CAD!) I also did some assembly work for him..
I also did the odd things about the neighbourhood: mowed lawns, washed cars, cleaned patios, shoveled driveways, etc.. I would approach the neighbours, and ask if there was anything that needed doing, and if I could do them..
Head out to the local 'unemployment office' and speak to them, to see if there is a 'student work program'. Some small stores will require a stock boy, or a shipper, some 'joe job' guy.
And here's a hint: Try to get work, anything! at teh local hobby / rocketry shop. That way, you're likely to get your supplies for cost.. Or strike a deal with the owner; you'll work for only rockektry stuff.
But ya gotta be there when he wants you , be dedicated to what you do, and make teh commitment to the job. if you start to slack, goof around, not show up one day, etc.. you can kiss the job good-bye. If you show enthusiasm & commitment, chances are, you'll keep the 'part time job' for a few years!