Mount and Blade

If your looking for a create knight game, i would suggest Mount and Blade.
It has a realy great battle system and you can try thev game for free until you reach level 6.
Currently the game is still in Beta fase. There isn’t a story mode yet. But you can play in a sort of sandbox mode which makes a lot up. You can buy new equipment, start a small army, join a faction and conquer a few castles.

Intressted? Download the game from the official website: TalesWorlds.com

Offcourse some screenshots: