extending asp.net/ C# application to build busines, data-access layer and sql

I have a working prototype of the C# application that connects to LinkedIn, authenticates the request and returns Profile data back. I need to extend this solution to have: Well-structured BAL and DAL layers, as well as SQL backend. The extended application will get the data from Profile, Groups, Connections, Comments APIs and save it to the SQL database (or update if the data has changed). You will define the sql schema and build necessary stored procedures. No UI except basic aspx pages required to show successful test. The code must be well structured and commented in details. The delivery will be in VS2008 or VS2010 solution.