[Q] Backup stuff to install Custom Rom.

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http://forum.xda-developers.com – Hello, I have some questions regarding installing custom roms on a Koodo Galaxy S3 i747M currently running stock 4.1.2 rooted. I'd like to try a custom ROM such as AOKP to get more out of my device, but I'd like to know a little bit more before doing so. I heard backing up with titanium backup saves a lot of stuff, but if I don't like the rom/battery usage how can I go back to stock 4.1.2 rooted? Also, how can I install and which version of AOKP should I try to install? How can I reset the flash counter if i switch roms? Will installing a custom rom wipe everything such as my music (ex (HowTos)