What game(s) except FF3us would/do you like to hack?

2) I'm gonna learn Java and then Android, in order of being able to make apps for smartphone?

There's an Eclipse build that is for developing Android Apps. If you develop Android apps, you'll write Java code so it's a good idea to start by Java. Personally for the IDE I prefer Android Studio.

3) i might not wanna discover how to do that with ruby code too, honestly...

Personally I think any programming language is more friendly than ASM. I much prefer dealing with a game engine coded in Ruby than getting lost in bank C2.