We're looking to try and start a Blood Bowl season in a few weeks...probably the first weekend of September to go with the start of the NFL season. Still getting in some more teaching sessions and seeing who would be interested in playing in a league. Will probably run pre-season over the course of August (with the exception of August 17th when I'm out of town).
We were figuring on hopefully having around eight people or so in this (more is fine) and having everybody play each other once during season. I have around ten or so teams at the moment and will fill out a couple more over the next month. So no materials should be necessary unless you wanted to buy your own team to play with.
Building your team up by having them get experience and learn new skills is a big part of running a league. It's like Fantasy Football, a board game, and an RPG all rolled into one.
If you just want to learn how to play or get in some pick-up games that would be fine too. No experience or materials needed.