Expert advice on app development

I have learnt the basics of c# language. And would like to start developing a mobile application that has accounts,threads,records,e.t.c (social, database) And as of now I have compilers on my tablet: Dcoder, and compiler. I would like advice on what parts I can make with these without a standard laptop-based sdk. And things like how to design the menu and account frameworks. And also if you know better mobile apps, feel free to share.Thank you