Can anybody tell me the origins of Falcon, like how he came to be? He's not very well known buy he's a lead character in the Super Hero Squad tv show. I'd like to learn more about him, he's a pretty cool character.

You could just read his page here on the site, it looks like it's been kept up-to-date pretty well.

well he was a sidekick/partner of cap for a while, but it turned out he was a former thug who had been brainwashed by Red Skull in an elaborate plot so he would eventually kill cap.  that didnt work out though

http://youtu.be/R3sNQgk6IxE