In August, Pete Williams, the creator of the MTV and Teletoon series Undergrads, gave a fabulous talk at Animatic T.O. relating the history of creating the show and getting it on the air. It was a warts-and-all presentation, where Williams was forthcoming about the mistakes he made.
He has a lot to teach anyone interested in selling a TV series. Until you've done it, you don't really know all the pitfalls and gotchas, so take advantage of the his experience and watch the presentation.