I need some tips on how to make money like this?

Hello Friends,

Has anyone seen the movie "Tokyo Drift" ? Well there's the kid named Lil bow wow in the movie who sells clothes and accessories/shoes etc. I'm wondering how in real life would I be able to do that? Would I shop at big cartel online stores and raise the price a bit? where would I get i pods and stuff for a low price and sell them for a profit. I got an idea a bit with the clothes since i'm pretty good with fashion and trends. but i'm wondering where would I get the stuff i can't like stuff that aren't released yet. Any tips on any other ways to make money and like this besides a job because i'll be working part time too? I've thought about this before I saw the movie too.

Thanks In Advance,
Romen Esko