Hi guys, Go easy on me as these questions are elementary. I've shot shotguns before (12guage) but I have no idea what the specs of those shells were. I'm about to receive my mossberg 500 combo gun and I'm looking to get some ammo. I'd like ammo for home defense and skeet/clay pigeon shooting and maybe some target range practice (slugs?). Can you guys tell me what I need to know or give me a general breakdown of the many different types of shells out there? Or even a general starting direction of what to buy would be great. Thanks! Btw I live in Southern California with many restrictions. Andrew.