any1 know anything about screen printing?

yeah, pretty offtopic. anyways, i was thinking of doing some screen printing on shirts, and i had a few quesiotns. ive been doing some reading on sites about how it works and the basics but i need a bit more info. if i buy a 1 color kit, theres no way for me to use more than 1 color right? or i can i would just need to take off and put on the screens again? i was thinking of buying a single color kit, cuz their cheaper and i dont wanna buy an expensive machine if it turns out i dont like it, you know just to try it out. also, what would be everything i need? to start printing? also do i NEED a flash dryer? i cant use something else or let it dry on its own? you can post here message me or email me idroptrucks@socal.rr.com thanks in advance