HUSNG Theory : Flop play in position

[ghettointlectual]

I have had this issue for a while and I have not been able to figure it out myself. I do not know how often I should be continuation betting on the flop after raising on the button. I play at lowest limit HUSNG's which are filled with calling stations. When I first started playing I would bet very often but that was spew because I would get called by bottom pair a lot, this eats away at my chipstack. How often do you continuation be? When do you not bet? Most importantly, why?