Answer:
Basically you need to contact your local school board. They usually are in charge of homeschoolers, or at the very least can give you some info on how to get started.
No, you do not need to be a certified teacher to "teach" your children. You just need to be dedicated to their complete education.
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The School board is not in charge of homeschoolers.
If you have a desire to educate your children the first thing you will need to do is find out the laws pertaining to homeschoolers in your state. The best place to do this is to go to the HSLDA's website. They list the laws for the states and territories. Some state require a certificate in teaching, some require you to take a class, others are less intrusive and view homeschools as private schools. Plus, you will need to find out how to legally withdraw your child from public school. That is why it is very important to find out the laws.
You will also want to find out what method will work best for your family. There are a multitude of methods out there, it can be a little daunting. You can research this on the internet. There are many useful and helpful sites out there. Time and perseverance are required.
With thorough researching on your part you will be an up and running homeschooling parent in no time.