Is there any colored plastic / fiber board I can use?
What wood and how to prime and paint it?
The most common natural material for this application is rough cut cedar. I would look at a material called AZEK that is a PVC composite, provided that I wanted a white finish. If you intend on painting a color other than white you may want to look at a concrete composite product a couple of links are added below for you.
Best of Luck!
