Just in the vein to keep you informed and offer you nice resources for your app development here are the links of a massive video series that will help you get started or, at least refresh some of your concepts.
This amazing series of videos will guide you through your first steps to create and app using C#.
Here are some of the individual links:
There you go, each video is around 10 mins, and focuses on an specific subject that should help you in your development. Let me know if you found the videos useful and the kind of apps you would like to create.