Don't fret over it - some folks still confuse magazine and clip...
when you go to either type of place, just explain your newness and you'll get help and a lot of advice (just remember that advice is worth exactly what you paid for it
).
Most folks will also typically let you try their guns for a few shots - try as many as you can so you can get an idea for down the road when it comes time to get your next one.
MY shotguns are more for clay targets and upland birds - what you call, IIRC walk-up or rough shooting, so my guns are geared more for specific purposes. Example, my main clay gun has 32" barrels and weighs over 8# while my main bird gun is a 20 bore, 28" barrels, SxS with double triggers and weighs about 6.5#. As you get more familiar with the uses of a shotgun, you may decide to get something specialized for a purpose
Have fun and welcome to the US