I'll add my support for having your local LBS or other bike club help out with this. DH and I started a junior racing team last year. It is A LOT of work. And now, we're dealing with things like CORI checks... This is all good, but more effort than we imagined as well.

Good luck - I LOVE the concept! And FWIW, IMBA and NICA (national inter-scholastic cycling association) have formed a partnership to try to get MTB racing leagues going around the country. There are several in place already - mostly in the West.

SheFly