Marketing through the web
There is marketing you site and marketing you products. First order of business is marketing your site. Search engines is one way, but you need to keep in mind that is not the only way. Getting a high ranking on search engine is more an art than a science. The more popular the key words that apply to your site the more difficult it is, and the more expensive. Some of the major search engine optimization firms charge several thousand dollars for a front page ranking for key works like auto, insurance, office supplies, flowers, art, etc...
Other methods of promoting your site are the same as what you do to promote any aspect of your business: ads in industry magazines, direct mail, word of mouth, business cards, newsletter, letterhead... and then there are specific methods like blogs, e-mail marketing programs (professional programs not spam), e-mail newsletters, links from other sites...
After taking care of marketing your site, then you can look at marketing your products. There are many styles of shopping carts, several different ways handing payments, you also need to consider sales taxes, warranty issues, return policies, how to handle out of country orders...
Glass Portal can help you find your way through this major maze of marketing through the web.