Star San is great. Just make sure that it's actually clean first, no visible dirt stuck on it. These are the things that gets bacteria and yeast to develop. If this isn't a wine fridge, you would need a temperature controller.
You said you are doing Gouda so I assume it is waxed? For that you really don't need much, just temperature control. If you want to get into any cheese that is rind-dependent you will have to take care of humidity, air circulation and enabling microorganisms to survive naturally in the fridge.