The following article will provide you with the Steams needed to get the Savage Wilds map running on your server.
Step 1: Stop your server.
Step 2: Install the mod from the Steam Workshop
Step 3: Place it at the top (#1 spot) in the modlist.txt
Step 4: Open your Engine.ini configuration manager and set the map to Savage Wilds and save.
Step 5: Start your server.