The FarSeer guru has posted some simple examples of how to use the excellent FarSeer Physics Engine at CodePlex,
http://www.codeplex.com/Farseersimplesamples. Use the comments in the code to figure out how to use the samples.
If you are a student you can get Visual Studio Team Systems or VS 2008 through Microsoft Developer Network Academic Alliance (MSDNAA) for no cost to you or your school if you are in a program that is offering these programs.
If you are not in one of the departments or programs that are part of MSDNAA then you can get VS 2008 through the Dreamspark program. Silverlight requires that you use the non-Express version of VS 2008.
I don't think that it is enough to be able to pick up Silverlight without having more knowledge about programming, it is a good place to start if you have some programming experience.
The FarSeer is a great physics engine, so take a look at it and these samples are a big help!