Custom User Management Program

Description: Basically this script is going to be run for a Club/organization to organize chapters. What it needs to do: So a school or club will come to our website and make a request to join. We will manually add them into this system. There will be one user who manages the school. The school is allowed to different groups: Officers and Members Schools will manually add each to the correct group. Schools will then have to pay based on how many members are in the chapter. The system needs to be able to create custom fields like e.g. School Name, Address, etc. Basically the system is able to create "subadmins" i guess that can manage their own members only. They manage manually add information ( name, email ) to each category. Not needed but: if the script can calculate the users and make a sum of $[login to view URL] ( say $1. per user) and allow the schools to checkout with paypal or create an invoice. Simple project keep costs low.