Here’s a summary of some of the design guidelines for the various mobile platforms:
Windows Phone
http://developer.windowsphone.com/en-us/design
Windows
http://msdn.microsoft.com/en-au/windows/apps/hh779072.aspx
Android
http://developer.android.com/design/index.html
iOS
https://developer.apple.com/library/ios/design/index.html
Another great resource on user experience design is the UX Mastery website
In particular the book Everyday UX is worth purchasing:
http://uxmastery.com/everyday-ux-remarkable-people-telling-their-stories/