I was lucky enough to get my first part time jobs in chennai because my mom shopped several times a week in our local grocery store and she heard they needed staff. I worked part-time during high school, full-time during the summer, and during breaks from college. Two of my three brothers ended up working in the store, too. My other brother worked in the drug store across the street which, of course, was also frequented by my mom on a regular basis. More than a few years later, that's still one of the best ways to find a job, though I had never heard of the term "networking" back then.
Start your online job search by visiting the sites that focus on online jobs for students opportunities. Searching Snagajob.com by type of position and location will generate a list of openings. There's also a list of national employers that hire part-time workers.