This is a unique exercise that is best used to add some variety to an already existing chest workout regimen. It's not the type of exercise you want to build an entire routine around. Thus, use it as a "filler" or alternating exercise.
Also, keep in mind that this movement is not for beginners. If you're an absolute beginner you may want to try more standard chest exercises like the flat (barbell) bench press.
If you can go heavy with the dumbbell weights, do so. This exercise doesn't need to be a finesse exercise (although it can be by using lighter dumbbells). Going heavy will put some mass on your inner chest area; this is a good thing because most people often neglect this part of the chest.