If you have flash, you need to learn actionscript. If you don't have flash, either buy it or learn another programming language (like python, java, c, c++, etc). To make a website, you need to learn html. Then, you need to find free web hosting.
Good luck. Though you'll probably get bored of it and give up. It's not nearly as easy as you think.
Or you could always use game maker, but game maker is for faggots.