How do I paint a pine adirondack chair that is unfinished?

It is for a school auction and we want to paint it white, let it dry, and then paint our kindergartener's hands and put their handprints onto it. I specifically need to know what type of white paint/primer to use and also what type of paint to do the handprints in, any other decorative touches, etc., and also how to seal it properly. It is a regular sized chair. Thanks for any help/guidance you can give. We truly appreciate it.