My picks for entry level Upland repeaters would be the Ithaca 37, Mossberg 500,and of course, Remington's 870.
For entry level clay guns, the 870. Both the Mossberg and Ithaca, while sturdy enough run light enough that recoil is exascerbated. The Ithaca's bottom feed design is a tad slower on the range also.
However, hit the range and talk to people. A well spoken, polite rookie will get lots of advice and can try out a variety of shotguns. After that, you'll have a better idea of what you like.