How to sell art.

Here's a question. I am working at selling my art, and am blogging the process over at Sell Art Online, and I don't know how to decide which paintings to start with.

I thought it would be good to start with six paintings, and those six paintings will likely share space on the same web pages. Currently I have mandalas, abstract art, and wax pastel drawings. So the question is this: Is six too many? not enough? should they be similar in style? matching in color? all different styles? contrasting colors? should I just go alphabetically down the list? or should I pick my six favorite ones?