My best homeschooling advice, free of charge, is: seek the Lord every year. You should pray every year for every child and provide that child with the education that you feel is appropriate given your resources, your child's needs, and your capacity. Each child is different and each year you will be different, as well. As God grows and sanctifies your family, you will have new needs, joys, and challenges. Our Father leads us all in unique ways, listen to Him and what He has to say one year at a time!
I homeschooled Rebekah for two years and then we enrolled her in Okinawa Christian School International. She has been attending there since January of this year. While it has been challenging for her, it has also been a blessing and it is exactly what we believe the Lord led us to do. It's meeting some of her needs in ways we never could. It's blessing her and growing her in ways our homeschool could not. But we may homeschool her again in the future--like I said, each child, each year, seek God.
I am wary of people who make blanket statements such as, "All Christian parents should homeschool" or "All Christian parents should put their kids in public school so they can be a light." Since when did our Lord call us all to the same thing? His is creative and we are a diverse body.
I do indeed believe that we as parents have a high calling to shepherd our children well. I would encourage all my mom friends not to automatically follow our society in raising kids. Pause often and ask God what His will is. Schooling is one of many opportunities for moms and dads to either do it yourself or to prayerfully delegate it to another party. Either way, though, they are your kids and their education is your responsibility.