What is a parent carer forum?
I'm not in Kansas, but I want to welcome you to the forum and offer you some resources to get you started.
First of all, relax! Your child is young, and you have a lot of time. It isn't a race, so take your time. I sort of re-assessed all my kids when they reached middle school age. Since they are finished learning all the basic things by then, it's a good time to go back and review anything they might have missed.
You might be interested in the free Welcome to Homeschooling guide.
Each state has its own homeschool laws, and they are all very different. In Kansas, a homeschool is considered a private school. Here is what you must do as of the date of this post. This isn't legal advice, since it's just a homeschool mom's interpretation on Kansas homeschool laws.
1. Register your private school.
Choose a name for your school. Register the name and address with the State Board of Education, and keep a copy of that registration for your personal files.
You must only register your private school’s name once, when you start homeschooling.
2. Select competent instructors.
Your child’s teacher(s) must be “competent.” That includes you, if you are teaching your child directly. (Kelly's Note: Most states recognize that a parent is uniquely qualified to teach their own child, regardless of their own educational background. Since the parent presumably taught the child to walk, talk, and eat with a spoon, they are in touch with how to teach that child. A few states require the parent to have a high school diploma or GED. Kansas just says you need to be "competent", without defining the term further.)