Start by "Patterning" your barrel, choke, ammo, at the distances you expect to be shooting. Home defence: less than 5 yds to 15 yds max. Turkey: 20 yds to 40 yds. Deer and other large game will have to be based on your local area.
You might want to try a "Rifled" choke. It helps with slugs, and it can act like a "Speader" and open up your pattern (Good for home defense).
Practice with Promo/On sale ammo, but always finish with your "Good-To-Go" ammo.
Go to the Skeet range and shoot "Modified" (No doubles, at first) Skeet. Use an "Imp. Cyl." choke for Skeet, and if they have trap, use a "Mod." at the 16 yd line. 1oz. of #8's will work well, for both.
Keep your head down and your swing smooth...