I'm not really sure if it's feasible to keep a lobster but I guess you could. I do know though, just like crayfish, they will snatch up any fish swiming by or any sleeping fish that happen to be floating near so I would not recomend any fish with the lobster as they will just be a snack one day for the oportunistic eater.
As for suggesting stocking, you have to be atleast helpful in saying what kind of fish you would like to keep. There are far too many ways to go that it's almost impossible to sit here and type all of them out. Do some research and then re-post asking if maybe the fish would work together or if you know you want, say cichlids, or livebearers, then we can give you an answer to your stocking question.