Flash isn't a programming language per se, though there's alot of commands you can put in it. To make flash, you need Macromedia Flash or a front end program. I wouldn't suggest you use Macromedia Flash, as it is a very difficult program to use effectively. It makes html seem like child's play. If you want to make things with flash, try a front end. I use a program called
Swish Max... it makes flash sites really well, I love it. Of course, it costs money, but alot less money than most graphics programs. It still takes practice to master as well... I don't suggest it unless you're serious about learning how to make sites (however you can buy premade sites/templates for Swish where you plug stuff in).
Check out this site for ideas about the program if you're really interested. Don't buy just the "templates"... they are pre made sites to use with Swish, but if you don't have the main program the templates are useless.
http://www.swishzone.com/