There are quite a few business you can start for free. There is also a ton of free and low cost ways to advertise. I have written an article recently aimed exactly at people like you.... beginners that need to know how to advertise. Here is the link to it
http://www.work-at-home-jobs-iowa.com/howtopromote.html
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"Turning Work at Home Dreams Into Reality"
http://www.work-at-home-jobs-iowa.com
http://www.home-business-team.com