I would go to your University's job placement office. Most universitys have that and they can help place you in a job, find internships, refine your resume and teach you interview skills and give you tips. Most University's also have an online job database and companies post when they have openins and it gives you all the info to apply. You can also look in your local paper, talk to the teachers in your department and see if they know of any openings. You can also try online job websites like careerbuilder.com. but just remember that for most of those jobs there are 100+ other peoplle applying for the same one. You can also try craigslist.com.. that's actually how I found mine and I love it! If you need any help or more info, PM me and I'll try and help you out. I was in the same boat as you this past summer, but I got lucky and found a great job
And just last week I got called about a job that i applied for months ago! lol. Sometimes it just takes time. Don't give up! And also, the realestate is a good idea if you don't find anythign right away, as you can do that for a few months and still look for something else
Good luck in your search!