Aside from the smart things like getting it checked out, learning how to care for it. Have you figured out what you're going to do with it yet? Most "off-season" use for a shotgun is done with clay pigeon games. The most common being a 16 yard trap. 5 folks stand in a line, first guy calls pull(lately Yeah or Yup works better for voice microphone activation), shoots the one orange (usually) frisbee that comes out. Second guy rinses and repeats.
It's a good game to get you started. From there you can progress to other trap games, or other more complicated games.
Generally Trap all fly away from you. Skeet are crossing shots. 5 Stand and Sporting Clays are all over the map.
I recently shot some skeet at a pheasant preserve in Iowa. Lots of fun. I hope to plan on shooting some 5 stand later today, since my local club doesn't have a skeet range.
Best General advice I can give you, beyond the Rules for every Firearm, would be:
For Trap, aim about a foot over the top of the trap house. Soft focus your eyes about 2 feet over that. Watch for the orange blur, swing onto that orange disc, and pull the trigger while swinging through. A shotgun is the original Point And Shoot.