Can any one give me about MVVM Architecture

Now I am enter into silverlight MVVM architecture for Helth module . I don't know about this MVVM architecutre. Now I want know about MVVM architecture like Below concets:

1.Model
2.View
3.View-Modal
4.Service like WCF--->Service
5.ICommand
6.INotifyPropertyChanged
7.How to bind XAML file
8.NHibernate---->Like Maping data from NHibernate to Modal 

                Give me any one about above concepts, they will help me to include into my project....