Making management system for windows desktop using WPF.

Question

I would like to work on a project where I can make the complete working management system ex. like billing system. I want to work on wpf template as for this project. I want to know the application architecture that will work while working on the project. I too have listened about MVVM approach. Please guide me to complete the project and the knowledge needed to work on application like this. Or any good tutorial reference will be helpful here.