Also for my hosting company

I need a ready made web hosting script asap like: [login to view URL] or any other Simple site with 4 pages and a script to register and mantain user info. Also the script must be able to send/track invoices and the payment for them thru 2CO I'm about to launch my own web hosting service for low budget. I will consider the winner to be the one who will devop for me other site also for hosting but this time not low budget one!