ok i just started the whole jailbreak/iliberty thing today im so new to this i really have no clue as to what im doing....

first off i found on here a guitar hero 3 app i download it on my mac but its blank its nothing it says its not a app....idk what to do....

2.when i do figure out how to download them right how do i get the apps on my phone from my mac? as well as background images i want for my main iphone page?

3.can i custom any pic to make my icons? for exaple im a superhero dork so could i use like supermans symble for idk txt then batmans symble for calling..????