I am not going to list the laws, rules, and regulations here, but I am going to give you a couple of links.
Don't forget to review the laws and ensure that you have done what you need to to do legally homeschool in Missouri.
Please find here Time4Learning's information page on homeschooling in Missouri.
Additionally, a place that is good to find information is A-Z Home's Cool Missouri information page.
If you have any questions or problems, or are unsure exactly what you need to do to homeschool in Missouri you could consult the Missouri Department of Education homeschool page.
I hope that you will find these resources informative and help you begin your school year on the right foot!