Here is also some eCommerce tips....
1) Easy Navigation Process
2) Least Number of Clicks to buy
3) Visible Pricing for Products
4) Online Customer Support
5) Advanced Search Module
6) Order Button
7) Put your products in more than one category.
Keep it simple.
9) A picture really is worth a thousand words, so use photos of your products and go easy on the text.
10) Market your site once it's live.
11) Make payment processing easy.