To make things easier for your end users you may set up lists of predefined layers to choose from. This prevents users from having to use the "Add Data" tool to navigate through the file system to find the layers or files they need.
First, you will need to create lyr files for each of the themes you want to include. These files can be created in ArcMap by right clicking on a layer in your table of contents and selecting "Save as Layer File". Before creating the layer file all symbology, joins, labeling, and any other layer characteristics should be set up.
Once you have created all of the layers, you catalog them for your users. You can also clean up your list and remove layers that no longer exist.