Marius' Dragon Age Campaign
Picture shamelessly ripped from here, which is a pretty good read in general, on sketching a background and giving some character hooks. You can follow his format for bonus GM points (you’ll die anyway) or just write me something with some idea of where your character has come from, and a goal or two as written in the player’s guide. Ties with other characters are optional, but pretty cool.
That’s about it, really.
Honestly I just wanted to link that image.