I spent last summer in usa working. i saw plenty of things and i dont know where to start

first of all... it might be a problem to get a job before having a social security card. You'll get a card in 2-4 weeks. so you just have to wait.
It depends which part of usa you decide to go but if you choose one of the citys where are lots of tourists it is easy to get a job. I remeber once a guy entered a restaurant which was hiring and he got the job immediately

If you have good english skills and you have a nice appearance restaurants will definately hire you
i also wrote some thoughts right after my trip. to my website:
http://users.tkk.fi/~jelehto2/englis...r_trainee.html
and if you have any questions i'll try to answer them
good luck!