What are you hoping to offer, exactly? Afterschooling? Homeschool curriculum? Part time enrichment?
There are an almost overwhelming number of directions to go with this sort of enrichment-- but much depends upon your child's readiness, intrinsic motivation, and interests.
We've always just encouraged our DD to read freely, and that has been more than enough. We use ALA booklists, MENSA's booklists, and our common sense about what seems worth reading. We strew books in her path, and the BookMonster eats them up and talks them over with us. We are frequent visitors to our local library and bookstores, and my Amazon expenditures over the past decade are downright obscene.
For some kids that might be sufficient.
Others might want to explore other facets of literacy, like NaNoWriMo or it's offspring (there are junior versions of them), book clubs, writing workshops, explorations of dramatic works (this has been quite helpful to my DD, as well, over the years-- nothing like reading and seeing Shakespeare to hone vocabulary and an appreciation for rhetorical mastery).
Read it, see it, discuss it-- that seems to work very well for many kids.
