Just got my first iPhone and had some questions..

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yes i just got the new iphone4 and its my very first and its freakn awesome!.
i got the proggy to jailbreak it n all that but dont got the hook up atm to my lap top so im good on jailbreakn..

only thing is i want the most out of my iphone with all the most useful apps AND GAMES must have and cool lil things to do.. and tweak it..

like where do i dl all these cool free jailbreakn apps ... (are there ones out there that are really really awesome that cost a few bucks i dont mind that if its very useful)

my buddy had a iphone since day one and he always had some cool shit on there

like all his buttons and theme to the phone was all super mario bros even the sounds how did he do that??

he also had a music vid ringtone?? how he do that?? you no cool stuff like that can anyone point me out in the right direction?? would really appreciate it thanks guys