As for jobs after your first year:
The best option, if you can afford it, is to work for a judge. This doesn't pay, but there are about 3 jobs in Pittsburgh for 1L's that pay.
After my first year I went back to the law firm I worked at before I started school, so I was lucky to get paid. But I didn't get as much experience as I would have liked.
Jobs can be pretty sparse after your 2nd year too. As far as I can tell, only the top 25% got paying jobs ($10/hr or above) for this summer. One exception to this are students who obtained a job and worked during their second year. It is hard to do this though because of the demands of school work. Writing cover letters, going to interviews and writing thank you letters can take a lot of time.
But it has been a pretty hard summer for law students, one of the worst I think.
So do what you can during the school year (either save or get a small loan to pay your rent for the summer, or live with mom and dad) in case you have to work for free. But you can't be distracted by this during the year. Get your resume ready now or do it over winter break, and have a basic cover letter ready to send out quickly. One key to getting a job is applying as soon as you can.