Xoops installation is easy, particularly if you have a web host that will do it for you. Once you have installed it you can log in as the Administrator and select your settings and options from the Administration Panel. You will need to install most of the modules yourself as the base package only comes with a few modules. If you do decide to install Xoops yourself, you can choose between four pre-configured module packs to add functionality to your site or select modules individually. Either way, you need to:
Install Xoops
Download the module or module pack.
Unzip it on your computer.
Upload the files to the appropriate directory in Xoops on your site - add modules one at a time so that if one blows up your system you know what caused it and can delete it.

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Activate and enable the module and choose your options in the Xooms administration menu under System, Modules on the left side of your admin panel.
Find a template for your site.
Download the template, unzip it and upload it to the templates file in your Xoom directory.
Activate and enable your template in the Xooms administration menu under System, Templates, on the left side of your administration panel.
Select and set up your system preferences under System, Preferences on the left side of your administration panel.