A.S.
I started homeschooling in 3rd grade with my younger son but my older son didn't join us until his 10th grade year. He continued with sports but then started in performing arts which was something he'd never done before. He loved it and is still doing it (though he has graduated from high school).
I would join a local support group and get to know some of the moms/dads there. You have a swath of ages and you will want to gather some info on the most effective (and efficient) ways to get the job done.
Here in Florida, if a homeschooler plays his/her cards right - he/she can graduate high school with an associate's degree (thanks to dual enrollment opportunities). It's a great way to get a bunch of college credits for free. My older son didn't take advantage of it but I've known other homeschoolers who rack up the credits.
Good luck!