I would suggest looking for jobs while you are still in college. Depending on your field of study and the field you want to work in, it can get pretty competitive out there. In addition, your major advisory for your study would have some suggestions, leads, etc. that you might be looking for.
One resource is the career center. There you have career counselors who assist with networking, resume writing, and interviewing.
Another tool that colleges offer is internships. Interns often are offered employment at the end of it.