Including ASP (active server page) to reduce amount of pages downloaded?

I'v designed a good amount of sites, but I'm currently designing an e-commerce site for a pretty reputable manufacturers. They have more pages than I'v dealt with, and I'd include ASP for anything that is the same page layout, but different information. But how would this work for so many pages? Does it need to be narrowed down? I usually do results.asp but do I need anything else before I make a bad move? HTML/CSS/JS I'm good with, but ASP is something rather new to me.