2NL FR

one limper in early position. folded to me on button. Holding AJs i raise 3xBB + 1 for the limper. Folded to him and he calls.

The flop is K95 rainbow.

He checks and i cbet 3/4 of the pot. He calls..

I'm sure the answers are different for a 20/12 villain verses 18/16 but in general....

What should i be thinking?? I don't believe i am always behind here but maybe i should?

What ranges might the villian do this with?

If A or J comes on the turn and he checks...now what

I guess my overall question (or a leak) is i'm having trouble distinguishing between calling stations and sneeky players that have me crushed...