My oldest has been on an FLL team for the last 3 seasons (10 weeks, Sept. - Nov.). It's been a wonderful experience for him. I coached his team this last year, and was assistant coach the year before that. I can tell you that coaching is a lot of work, especially as a homeschooling parent with 2 kids too young to be on the team. With the help of the other parents on the team though, we were able to make it work.
It was so worth the effort! FLL teaches so much. I could rave on, but I'll save that for another post. :-) For now, here are some places to gather your own info.
First, just get some information about the First Lego League. Poke around their website.
Check out the "start a team" link.
Check out this year's challenge.
If it's tournament season, check out some local events.
If you have just a day to spare and want to see what a tournament is really about, volunteer to help at a local tournament.
If nothing else, check out some of the great FLL and LEGO robotic videos on youtube.