speed ball kits are a good way to start (kinda)
if you are going to get into it "for sure" go ahead and buy the real stuff at least as far as screens, squeegee
you can start w/speedball emulsion/ink if you want it sucks, butt its kinda forgiving if i remember corectly
if you are looking at a 4color carosel you dont need a 4 color press to print posters. just jiffy hinges and a smooth surface to screw them to
i cure my t-shirts with a flash drier. its the same heating element as in a small conveyer drier you just have to figure out the time it takes to cure
those ebay 'printa' systems (all in one kits) are a rip.
You want to dabble cheap and small and get inky, try the speedball kit.
Past that, with the tips here and a couple of hundred dollars and your new found friends at the screen supply shop or local screenprinters (talk to the tech guys, get some used frames, a squeegee, some ink - I always found a six pack goes a long way if you are looking for information and deals) you should just get printing and quit wasting time on the interweb.
the sooner you get started the sooner you get ink on your good clothes. then you are on your way to becoming a screenprinter.
also when i wanted to learn how to print i called every printer in the yellow pages and asked if they needed help from someone who wanted to learn and had no experience. one of them did, the owner was a dick but the actual printer was super cool and taught me a ton. plus i got to use their equipment for a bit.