Well... This is a free script that you need to install on your webserver, just like a software like Microsoft Office you need to install on your personal computer. Its rather easy to install though, first download the script from our downloads page and then upload to your webserver if you use a webhost(you can skip this step if you host your own site, but its quite unlikely for most newbies). To install the script, run the installer and follow the instructions.
This script does a lot of things for you. It has a built-in breeding and itemshop feature, and of course a lot more than these. Read the features list if you wanna learn more before getting started. Best luck!
http://www.mysidiaadoptables.com/features.php