Though we started researching homeschooling very early, we've lucked out on the need so far. One thought, you might like to read through the common core standards to get a better gauge of where end of year testing will be going. http://www.corestandards.org/

I really liked the Unschooling Handbook which gives a nice perspective on child led learning. http://www.amazon.com/The-Unschooling-Handbook-Childs-Classroom/dp/0761512764