To anyone who can hlep with this:
 I will go into steps of what I am doing to clarify My question, hopefully this is not too confusing: 
I go into BVAdmin/ Catalog>Product Tab and create two test products for my new category I will create and make sure these products pinpoint to the new category. 
I then go to BVAdmin/Catalog>Categories Tab and create a new category name.  for example I create a category called: HDD. 
I then go to sitemap.aspx section of my store and I see the HDD link under SiteMap and Product Catalog Headers.  It also updates a link in the Peers Column. and I see my products in this page 
I can click on either link in the sitemap.aspx section or the peers column which takes me to that products page, which I show in my url address bar as:
http://localhost/Departments/HDD.aspx(my question is how do I control the content in this page: is it by editing the category.master file and the style sheet category.css? Or is it something else?) 
Also  on this page:
http://localhost/Departments/HDD.aspx  I click on the test price I created for this product and it takes me to this page: 
http://localhost/Products/test__test.aspx(my question is how do I control the content in this page: is it by editing the product.master file and the stylesheet products.css?  Or is it something else?) 
basically what is happening on these two pages when i create a new product and new category, the products are positioned under my flash header title which resides in my header.aspx file, so I am trying to find out the master page or page that will control these two pages when I start positioning content with div tags:
http://localhost/Departments/HDD.aspx http://localhost/Products/test__test.aspx Thank you to anyone who understands this or can help me with this,
Dan