Directory & Subdomain creator; then runs install script

So; This is going to be a tough one to explain; but I got it all up in the head. I dont need any styles for this; It can just be created and left looking ugly and style free as I can take care of that. I will try to take you through the user process. 1. Textbox where user can search availible subdomains on the [login to view URL] domain. (Probably by checking if there a directory which exsists or whatever) 2. Once the user finds a domain which is not being used they click continue; it then creates a directory and subdomain with the chosen name and extracts our installation script to the directory & forwards the user to thank you page which explains how the propagation works and what not. You can leave a placeholder on that page. This is just the first step to this project; I will probably create more. However I think this should be fairly simple with someone with adequette knowledge. Server: php/mySQL/cPanel interface. Let me know! Thanks!