Your fellow shooters will appreciate your knowledge. And if you have been hunting for years, be aware that the rules for gun handling are slightly different at the gun club. Don't assume you know. Start with an automatic shotgun . There are enough new things to try to remember when you start shooting without worrying about your gun too.
Pumps are too clumsy for beginners.
Single shots won't work for doubles. Over and Unders are heavy and tend to kick. And sides by sides just have too many triggers. On the other hand, an automatic has a true site picture, light frame, and little recoil. They are also affordable, easy to operate and will grow with your abilities.