These can include national bulletin boards, websites of national organizations that you belong to, the classified section of your local newspaper, and the website of your college career center. Having the targets will give some focus to your search by making sure you at least check those sites before wandering off into a new direction. If you aren't sure where good search websites are located, check the website of your Career Services Center. They will probably have links to other web pages that are good places to start. Third, understand that the job search, whether electronic or otherwise, takes time.
Some people describe it as a full time job in itself.
Also, don't limit yourself to one job search style. I would also add a word of caution. A popular thing to do is to put your resume on your own web page. There is the advantage that more people may surf onto your web page and you might get a job. There is also the problem that more people may surf onto your web page and someone might steal your credentials or get your address and phone number and make life miserable.