Will do, thanks a lot.Safety first. Learn the range rules, and then learn the trap ettiquette. Next work on gun fit and technique. Research stuff on Youtube. Look for the professional videos, not the backyard bubba videos. Once you have gotten that far, then worry about shells and chokes. Just use shells that are allowable at your range, usually #7 1/2 or #8, and screw in a Modified choke. If you miss a target, it won't be because of the shell or the choke. Welcome to the sport and the forum.
Ok thank you.I suggest you shoot 1 1/8 oz of #8 shot at 1145 f/s to start with.
Also get to the patterning board or if your range does not have one ask if you can shoot at an empty target box at 13 yards in a safe area designated by the range. Create a Point Of Aim on the box, mount the gun, focus on the POA and fire. 1 inch high equates to about a 60/40 pattern at 30 yards. Hopefully you do not have a right/left problem. Do this for both barrels and all your chokes in each barrel. This tells you where you are shooting. If you find that the gun is not shooting where you think it should, you should then shoot from a rest and actually aim (focus on the front bead and align it with the POA). This will tell you where the gun is shooting.