The Calvert School is a very good one, but as far as I know only goes through 8th grade. I knew some kids who used it and the following year enrolled in the community college (since they qualified and were still under age), it was free.
Homeschooling is not for the faint of heart, lol. It can be hard, fun, very interesting, boring, hair-pulling and lead to burn out if you push too hard, kids don't work as hard you want, etc.
Sometimes when going from regular school to homeschooling kids need a phasing in/phasing out period. Even though they've just had a summer break, they were expecting to go to school maybe?
I can suggest several different websites to check into, either for the homeschool yearly plan or materials to buy. I hold no interest in any of these companies and do not receive any compensation for mentioning or linking.
Rainbow Resources has a lot of curricula and offers highly-respected opinions on materials.
Love to Learn dot net has good prices.
Memoria Press is classical education and a good resource for Latin materials.
Saxon Math is popular, some like it, some don't. I find it easy to use.
Charlotte Mason Education, check out: ambleside online. This has year by year planning for a more "relaxed" approach.
If you are truly interested, deeply considering it, I can give you more resources to look up on the 'nets.
When first starting out I read John Taylor Gatto's Dumbing Us Down. I also read Homeschooling for Excellence by David and Micki Colfax who were school teachers and left NYC due to violence directed towards them, who turned to raising their kids in the country in California. After college, one was appointed to be the Director of the Office of National AIDS Policy by Pres. Obama.
I was told I was being brainwashed reading these crazy books. Mr. Gatto was named NYC Teacher of the Year in 1989, 1990 and 1991 and New York State Teacher of the Year in 1991.
I just wanted my kids to learn and not be afraid. I started homeschooling because my little first grader was being bullied in the restroom. The teacher's answer to my displeasure was for him to use the faculty restroom. Really?
Are my kids geniuses? No. Yes. Maybe. I had hoped they would do really well, but it was hard. Now, we are nearly finished, just a couple more years to go with the last couple of kids. Drugs, including heroin overdoses and deaths, and teen pregnancy in high school were and still are pretty popular past-times in the school districts we have lived in.
Don't skimp on the basics: reading, writing, spelling, math, technology, science, history, geography, art and music, exercise, and chores. No television most of the time. Restrict the internet usage. Some kids just can't stay on task unless you are standing or sitting right next to them, so be aware of that type of behavior/personality/habit.
Take it easy on them and yourself. If you are a guy and you want your wife to do it then forget everything I have said. This was all on me, not my husband. He has been supportive through it all.
I did the planning. I never used companies like ABeka or other boxed curricula. I pulled it together from various resources.