Decide if you prefer that the philosophy of the school be based on a particular denomination or be multi-denominational.
Determine if the boarding school should be within a certain distance from your home. You may prefer to be relatively close so you can visit your child more often. It's a good idea to drop in unannounced occasionally to see if the school appears to be functioning well and the children appear well cared for and happy.
Choose a few schools that meet your requirements and contact them for more information. The Boarding School Review has extensive information on all nondenominational and Christian boarding schools.
Review each school carefully. Consider the school's commitment to Christian ideals and research how much religious training your child will receive. Learn about the school's disciplinary policy and determine if it is consistent with your standards.
Narrow your list down to a few schools and go with your child to the boarding schools you have chosen. Speak with the headmaster, the admissions department and the faculty. Tour the school with your child to see if they feel comfortable.