I worked at a law firm as my first job (age 16) and found it to be a very rewarding experience. True, you're going to end up doing a lot of tedious work, but it's worth it because you get exposed to so much. I got the job by calling several different law firms and offering myself for the summer as a volunteer. I went to a couple of interviews, and one firm actually offered to pay me, so of course I took that job.