GTA Connected scripts and server-provided content are called "resources" and are located in the resources folder of your server's directory. Information on creating and using resources can be found on the resource info page. If you need scripting functions, the main page provides information on scripting functions and ID references.
The server.xml file stores the basic configuration for your server. This file tells your server what resources to load, what port to run on, etc. There are lots of configurable options here. More information on the server.xml file can be found on the server configuration page.
Instructions for setting this up can be found on the linux server page.
The windows server comes in both 32 and 64 bit architectures, so choose the one that corresponds to the host. More information on setting this up can be found on the windows server page.