35635 Script Installation Repair

This is probably a very simple project?? I need someone to figure out why a replicating script isn't working, and to repair the installation or script as needed. The script was custom written and somehow got corrupted on it's original server. Shortly after the original script was installed I downloaded all of the files onto my computer for safe keeping. When the script got corrupted (roughly 1 1/2 years later) I uploaded all of the files from my computer via ftp onto a new domain. The only thing I changed was the domain name to the new one in all of the files, and some of the html in the template files because the pages on the sites were updated several times since it was first installed. I uploaded everything exactly as saved, but I can't get the script to work. Instead of a main page I am getting the /index of page and it is listing all of the files. All the files seem to be there??. The main thing I don't understand is the MYSQL Database?? I created one just like on the other server, but have no clue if it was created correctly. This may be the only problem?? Anyway, I need someone who can repair the installation so the script works again, and then to possibly provide further support and upgrades as needed at reasonable rates. It is a simple replicating site script that replicates a 10 page website. The URL is available on request if you would like to take a look at what is there. Thanks.