What I know about how to set your concealer and foundation! (W.I.K.)

Find the perfect foundation that is closest to your skin. 
As for concealer, 2 shades lighter.

Get some transparent powder.
 


Squirt Foundation about 2 pea size on your hand, get a brush and paint it on your face and a bit on your neck.
Once done, CONCEAL TIME! :D Usually, it's under your eyes, redness on the side of the nose, side of your mouth and under your mouth.
Then Put your powder to set them both.