How to Get Started Homeschooling - State By State
I'm located in the state of Texas, and many of my clients are too, so I'll start here. I'll include information for the other states as well.
Before you move on to your state, a great resource you might want to check out is the "Special Needs Homeschooling" Facebook page. They post tons of great resources! You can also ask questions and receive friendly and helpful resposes from other parents.
If you live in Texas, the first step I suggest that you take is to connect with the Texas Homeschool Coalition. They are a great source of information, and provide lots of support to their members. They have a great guide on starting to homeschool called, "7 Easy Steps to Begin." This guide will help you become familiar with Texas laws, requirements, and how to withdraw your child from school. You can find the guide here: http://www.thsc.org/getting-started/7-easy-steps-to-begin/
Another resource is the Homeschool Legal Defense Association. They have a page of Texas homeschooling laws and a page of Texas homeschooling associations. There's also an online homeschooling discussion board where you can ask questions and talk with other parents.