[Q] Building a Rom (adding Mods)

[galaxys3lover]

Hey ! i ve been trying to build a rom and reading a lot of threads i ve been successful , ive built a rom based on official firmware , add root , deodexed , edited some png files etc , but i would like to know how to add mods to a rom , like mods like volume buttons to skip track , hide sms from call logs etc.. ?


Links to threads atleast , any help is appreciated , am just trying to learn

Cheers