Chip and Pitch Tips was written by one of the best players here. It's in the FAQs and should get you going. Basically, though, when chipping you need to know 2 things. The first bounce must be on the green and the shot will roll. Throw in those fast greens and you're in for a ride, especially if you're chipping from above the pin.
Flopping is an excellent shot to minimize this roll out but you need to practice with it to see just how much. Keep in mind, as in the real game, a flop is executed by laying the club flat on the ground which causes it to go right. Aim left accordingly. GL