Steven Porter of Wintellect has published a nice article that lays out the steps to build a basic application with Silverlight 1.1. The article and samples are available here:
Managed Code Shines in Silverlight 1.1
If you're trying to get a handle on using Silverlight 1.1, this is a great place to start. Steve knows his stuff, and walks through a sample application that is easily understood.