I agree with so much of what has been advised. Join HSLDA. Saxon math is the best I have found (I taught high school math and Latin in our local home school co-op..). If possible find other home school moms to swap classes with. And I didn’t sign up for a preordained curriculum. If your son is very bright, it won’t serve him well. Cathy Duffy told me, when I first started, that you could either homeschool or you can school at home. Homeschooling offers you and your son the opportunity to explore his talents and interests. There is plenty of support here should you need advice, encouragement congratulations or commiseration. And at various times you will need each. I think it is easier than sending them to school, but it is also a lot of work.
And it really isn’t as scary as it seems.