mobile security framework for Apps

Hi all I am a new or I don't have a lot info about mobile security and I need to Know.. I Need to develop a new Apps and I want to study a lot about security like secure all the Data in the Apps ,source code and a network.....but I don't know How ???? please help.. 1-what the steps or methods to secure a sensitive Data in Apps for mobile?(ANS,more technique not just talking ) 2-How I can develop apps with more security to source code? and what I should to start to study about from the start.. and finial is there any thing related and explained how to start please tell me ...

Thanks