Protect the Beacon, Buy Supplies and Kill Zombies for cash. The Beacon has your supplies but also attracts waves of increasingly more and stronger zombies. Use the Vendoneer perk to increase the stocks of the secret stash and build a base to withstand the assault.
You can then copy the entire contents directly into your game folder (it should overwrite files in the Data folder and add a Mods folder). Make sure you have a fresh copy of your game if you previously installed any other mods.