For general advice on web application development in .NET, you might want to post to the asp.net forums over at
http://forums.asp.net/as there are more folks with that interest over there.
There's a beginners set of getting started resources at
http://www.asp.net/get-started/that will probably be useful too. For instance this video:
http://www.asp.net/learn/3.5-videos/video-49.aspxmight help with your scenario in particular, and this page
http://www.asp.net/downloads/essential/will let you know the essential tools for working with ASP.NET to build a web app. There are also some pre-canned app starter kits over there at
http://www.asp.net/community/projects/which might kick start your project.
Hope that helps,
Mark
Mark Wilson-Thomas - Program Team - WPF & SL Designer for Visual Studio - posts are provided 'as-is'