Use light layers and blend well for the most natural finish. A damp sponge helps foundation and concealer melt into the skin, and a light dusting of powder followed by setting spray keeps makeup looking fresh all day.
I do tend to have dry skin and to avoid concealer creasing on my underyes I'd usually spray some setting spray on my powdered power puff and gently tap on the undereye area. So far it has worked perfect for me and I haven't had any issues using this technique.