Our Lady of Guadalupe, the sequel

Have markers, will freak out

So I finally(after about ten years of wanting) got a decent set of prismacolor markers to play with. I have yet to really figure out how to use them. Color is a relatively new concept for me, and markers are a foreign language. They are, however, essential to the type of illustration I wish to master.
If anyone has a direction to point me in for tips or tutorials, I would be very appreciative.