If you are marketing other companies products (affiliate marketing) you could market your affiliate link in many free places. If you have an advertising budget then take the time to learn pay-per-click advertising, however yo will need to have your own website for PPC.

You could open a free Squidoo page to market your products.

We have free weekly conferences teaching internet marketing. You can also contact us at our contact us button at ViralMoneyList.com

This free e-book lists over 20 methods of advertising for free and many methods have hundreds of sites to market at.

1) Build a website first. And find a reputable web designer. Stress the need for “Search engine optimization” (SEO). This is a way to insure that sites like google and yahoo place your site toward the top of searches under specific key words. It is not cheap to find someone who is good at this. My company charges >10,000 for 5 key words. We are a Business to business designer so no need to advertise myself here.
2) offer a catalog with shopping cart and focus on filling orders quickly.
3) Help to develop a brand name for yourself through news stories, banner ads and tile ads. advertise in sites that are appropriate.