Originally Posted by R_Hythlodeus
The movie basically writes itself.
Young Clint and Barney flee from the orphanage to join the Carnival (or a more 21st century equivalent like TV show on History channel), where the criminals Swordsman and Trickshot train those two naive young boys to become masters of archery. After years of training, Clint learnes he was only trained for the reason to commit heists, so he decides to turn his teachers to the autority. By doing so, he ruins the plans of SHIELD who were observing Swordsman and Trickshot for a long time. Swordsman, Trickshot and his brother Barney can flee. Clint joins SHIELD to help find them, mainly because of Natasha Romanov. At the end of the movie, after a huge 4 way battle, Clint gets promoted to official field agent status
Something like that sounds about right.
Something I think could be cool is if they told Hawkeye and Black Widow's origin story together in one intertwining movie that cuts between both stories LOTR style, where they'd go from Aragorn and crew's journey to Frodo's journey seamlessly.