I want to show a quick way of adding FluentNHibernate into your project.
First make sure you have NuGet installed in VS 2010. You can find it in the Extension Manager.
Now you can use the View->Other Windows-> Package Managere Console and write
nuget Install-Package FluentNHibernate
This command automatically retrieves the latest version of FluentNHibernate from nuget.org with all its dependencies.
Next you’ll have to start configuring FluentNHibernate, have a look at the tutorial found at http://wiki.fluentnhibernate.org/Getting_started.
Enjoy