at home? Can I buy books at a bookstore to study at home and then take the exam? Or do I have to take the pre-requisite hours in a class room? Looking for the most economical and easiest way to get this license. I have a PhD in Finance.

You have to take a class through an approved school. Don't take this wrong but for someone with a PhD you sure need to learn to read. The state website is very specific as to the requirements to obtain a license.