From the Virginia Boys State Website:

Submit an Application for Sponsorship [PDF] (updated 2/10/2017) along with the application fee ($400.00 per delegate). 

2017 Boys State sponsorship form

Money that accompanies the Application for Sponsorship must be sent to the registrar prior to filling out the online registration form (in step two).

The registrar will send you the registration numbers for your candidates, and the user name and password needed to complete the online registration along with your receipt.

2017 Boys State Sponsorship Application