Simple Admin Panel with Admin/SubAdmin/User

Hello i have a database that contains members and their information i need an admin script where there will be 1 main admin that creates sub admin accounts then he links each sub admin account with a certain number of users then those subadmins can post messages to their assigned users or change their information and the users can reply on the wall of messages to the subadmins and change their information too If you already got an admin script ready, you would modify it slightly to fit with my model, so i consider it a simple project i'm willing to pay 100$ only, but if you show me a prototype (design) of your admin panel first you'll have more chance of getting me, but try anyway :) you may be lucky And i hope you do good work for me.