Homeschool by 2013

Hubby said that we should seriously consider to homeschool our children by 2013. That will be the year my eldest will turn 10 years old. My SIL whom homeschool all her 5 children advice us that we should start homeschooling before the child turns 10. After 10yo, their character will be more difficult to mould. If I homeschool my children, I can't provide them with Science theory if they like the subject and wants to become a doctor or pharmacist. Without it, they can't further their studies in college in that stream. How can my children become a doctor or get Pharmacist Jobs? How?