I posted this a while ago. Not a lot of advice, but a nice comparison to what works better to that which stumbles.
I am playing with a treatment myself, but I consider it recreation at this point. My family enjoys getting a laugh out of it so far, but I'm no comedian. Still, I think it has a place in cable, somewhere near 'Reno 911'. Best of luck to you, this is dangerous territory. You should check out some of the links on this page about it. Normally, your ideas just get stolen.
I posted this before:
TV Pilot treatments are vital, plus they are really a blast to write. They tend to be really really long, and detail where the cast and story is going. Spec writers can then plug right into the story for their contributions.
Two current treatment examples: Lost vrs Heros. Seems to me Heros had a much more cohesive, flexible treatment. Lost seems lost, no direction, no flexibility.
I would love to write a show for Heros, add a new character. I'd definately write for the Hiro character. What a hoot. Where in time would we go? What mutant skill does he need to team up with to fulfill his quest? Man, I'd kill to intern on this staff.
But Lost, what would I write? Beat up Sawyer. Kate gets teary eyed, can't choose between the two hunks. Beat up Sawyer some more. The others do dastardly deeds. Flashback on Sawyer getting the snot kicked out of him. I really liked this show, too.