In google webmaster tools, just click add sitemap. Enter the url for your sitemap which is
http://www.yourdomainname.com/sitemap.xml
That's all there is to it.
Google will view your sitemap online and check it within a few hours.
On the new page content, just put product_index.asp in the LINK field at the top.
For the product index or category, you don't even need to create a page unless you want to. The pages are there and you can link to them. On my site, in the footer I have href links to them. just link to href="product.asp" or category_index.asp or whatever they are called. works GREAT! adding a page content would probably help with crawlers though.