I grew up in Hingham so I know the area pretty well. As Big Fish "Larry" said you won't find many guys that will tell you exactly where they fish. Certain well know spots. Like "Hull Gut" are ok to discuss cause anyone can get there Just keep driving
I can tell you that there are nice fish in the area. I spent a month on the vineyard last year only to come home to Hingham and catch my biggest bass ever 40"+.
Chunk bait and Clams are an easy way to fish the area but some people myself included prefer to plug and work the shore. I would make sure the tide is up if your fishing in the bays and rivers find a spot with moving water and structure and you will be on your way!