Find a bird that's gobbling on the roost. I generally let them gobble on their own. Set a decoy 20 yards from a big tree and set up. Call sparingly (2-3 yelps). Be patient. They don't always gobble right back at you, and sometimes just appear. Your gun if fine. I killed a bunch of birds with a 12 gauge with modified choke before I could afford another shotgun. Get a diaphragm call. Don't worry if you think you don't sound good. The turkeys probably won't care as long as you sound somewhat like a hen. My biggest mistake in 20 years of hunting is leaving a setup too soon. I have stood up many times only to see a gobbler or gobblers take to the sky.