Hi..
Actually hard to learn by self for Flash program, because have there are alot of basic knowledge that you have to know before start with flash program...anyway take alook on below website..
Cheer up..
http://www.w3schools.com/flash/default.asp

i wanna upload a .swf ....can u tell me sites where i can host my .swf?pls

Register below web and you can upload both Photo and .swf (Flash file).
http://photobucket.com/

it's really?..can i upload at photobucket.com a flash file?...thnx u so much....

Yes, you can...
ur welcome...