Problems with E-Commerce

I have installed the E-Commerce plug in but am having problems making it work for me. I already have a page on my website that says Buy DVD and so I want the products on there, not on a separate products page. Is it possible to do that? Also, even though it looks like I have set it up correctly, when I do a view, instead of having the price clearly, the price is crossed out and then there is a sale price of 0.00 even though my sale price space is blank! Thanks.