I home schooled my son and am home schooling my daughter, both in high school, both for medical reasons.
I learned some simple tips for homeschool success.
Join your online local or state homeschool support group. They will be able to tell you the various resources available to you, the laws and regulations governing your child's curriculum, and the cheapest places to purchase the resources and required curriculum.
Consider not joining a religious curriculum based homeschool. It adds extra subjects, which mean more work for your child, who may already be having difficulty adjusting to their new workload. Religion is something that is better taught through family conversations, behavior, and by attending church or the equivalent, depending on your religion.
Find out your state's or country's curriculum and stick as closely to it if you're constructing your own curriculum. This is important if your child wishes to continue on to college or university in the future.
Consider attending a state approved homeschool with a pre set curriculum in the beginning, until you get a toehold on homeschooling and are more able to construct your own curriculum.
If your finances are tight, search for free homeschooling resources. There is a lot available if you have a computer and internet access. You will have to do a lot of your own work with this in regards to constructing a curriculum, but the savings can be worth it.
Consider encouraging your child by doing your own end of term reports. Put in positive comments and point out areas where they could do better in an encouraging way.
Don't try to plan ahead more than one year at a time. I actually plan only one term at a time, and it works really well. If my daughter is not challenged enough, I can adjust the next term's curriculum to challenge her more. Same thing if she is overwhelmed by a certain subject, I can adjust things so the following term is a bit easier for her and rebuilds her foundation knowledge in that subject.
Having a quiet area in the home with a comfortable desk and chair is vitally important. As I have a shift worker husband who has shift working friends, I encourage him to visit them during the school day. If this is not possible, I take my daughter to the local library with her books for the day, and study in air conditioned comfort.
When your child is in high school, unless they have learning difficulties, you may find they are self regulated once they get into a routine, and you're at a loose end. Doing housework is not a good idea while they're studying - I do housework during her breaks only. So it's a good idea to take up a hobby such as craft, reading, writing, or anything quiet that you can easily interrupt whenever your child requires your attention. This prevents you from hovering over your child or doing more noisy things. I read, write, and do quiet exercises while my child is studying.
Discover if your state has examinations with official grade certificates that homeschooled children can attend. These are useful especially in high school, as you can see if they're keeping up with state education levels, and also so they can obtain jobs later on, as school certificates are often required by employers for young potential employees.
When your child is starting out with homeschool, don't lay out the entire day for them. Just tell them your schedule - for example, 9am till 10.30am then break till 11am, then continue till 12.30pm then lunch, then resume at 1.30pm and continue till 3. So they know they will be working all that time. Then only give them bite sized amounts of work. My daughter feels a sense of accomplishment if she is finishing something every 40 minutes or so, so I have worked out how much to give her in any given subject to fulfil that need of hers.
Keep a diary and lesson plan. Stick to it as much as possible, but adjust it according to your child's ability as you learn what your child is capable of. They will do much better in some subjects than others, and will need less time in those subjects.
Try to encourage your child to take up social activities outside of school. Martial arts for the solitary child, or Scouts for the more social child, are a good place to start. Physical activity is important, and they tend not to run around much during homeschool like they do in regular school, so consider signing them up for their favorite sports activity a couple of times a week. Visit or invite over family and friends frequently if they have children close in age to your child.
Homeschool is a wonderful way to focus on the strengths of your child and improve their weaker areas. Enjoy this time with your child, so many parents don't get to spend this amount of quality time with their children. We are fortunate.