Hello all. My sweet wife got me a Mossberg 500 for Christmas after a year of telling her I wanted one. It's the stock gun, but it came with a pistol grip and both the long and short barrels. I'm fairly new to gun ownership (just got my first handgun about 6 months ago) and this is my first shotgun. Does anyone have any suggestions for other important/necessary accessories that I should get? Recommendations on ammo? Any general advice about this particular model that a newbie should know about? Thanks in advance!