Oh yeah...fantasy land baby...Well, if I had them, it'd probably be from a genie wish or something of that sort.
First I'd learn how to use my powers. Once I master flying and controlling my speed I'd head over to the mohave desert and test stuff out. Always being sure the moon, sun or any other important celestial object is out of my way I'd get used to energy blasts. I'd also learn how to unleash (they'd already be unlocked, but I'd have to see how to summon them) the Super Saiyan transformations (1-3; 4 just sucks and isn't canon)
I'd live normally and try to keep my folks from noticing. I'd have to quite Tai-Kwon-Doe to prevent myself from accidently killing the elementary school kids who I have to spar with there.
I'd only let my two best friends know. One would be sorta weirded out; one would be completely geeking out. The latter is an uber Vegeta fan, so he'd have me take him with him to my training spots and try to recreate the Final Flash and Big Bang Attack.
I'd pay attention to the news and wait for something highly publicized to happen in the US (a disaster or something else) There I'd make my appearance. I'd probably have Goku's Uniform tailored as a costume. But to prevent myself being recognized on TV, I'd make sure I always appear on the spot as a Super Saiyan.
My first appearance would be a quick, but very flashy display of my abilities. I wouldn't kill if it could be avoided. Albiet I'd probably have disintigrated a few people's limbs trying to shoot-to-wound. If there were any cameras around, I'd be sure to call myself the "Super Saiyan" and tell everyone I'm a Republican and a conservative...THAT'D cause a big shift in the political parties...he he he...
From there on I'd continue my work in computers (constantly backing things up on disks incase my power level rises too high and causes my PC to explode).
I'd enter various (not televised) martial arts competitions and earn my way to retirement in prize winnings! With that sorta cash I'd buy any PC software I need or want...
Well, I'd help clear the rest of the insergents out of Iraq so our troops can come home with a mission accomplished. I'd let one live to tell of their massive defeat and my power to the head of Al Qaida with a warning of what would happen if they didn't disban their organization. I'd stop Palistine once and for all so they'd finally leave Israel alone.
Oh, and of course, if any enemy mocked my apperance and thought little of me, I'd descend back to my normal form quickly and give them a little..."lesson" on Super Saiyans...ah...for that one, I'd probably be aching to bring along a boombox so I can time my transformations to the SS3 Powerup theme...God that'd be SO COOL!!! But it would make them take me less seriously if I had my own theme music. Oh well...
If the government ecer found me out I'd have to go into hiding along with my entire family. The only way they could kill me would be by depriving me of oxygen or something, but they could most certainly threaten my family.
They'd probably want to lock me up in some area 51 type place too to study my powers. That would be the most unfortunate thing.
But oh boy...would it be
fun...
Oh, and ps: I'd probably have to avoid Akira Toriyama as well, since he might try to sue me for copywrite