Wroar offers a very good article on tanking as a prot warrior. Offers a review of the prot talents plus a few in the fury and arms tree that can be helpful to warrior tanks. The guide should prove helpful to any aspiring tanks. Contained within the guide is a link to prot gear and gems which I'll link here.
GEAR AND GEMS
Remember this is only a guide, you can stick to it religiously or us it as a guide line and establish your own style.
SINGLE TARGET THREAT GEN ROTATION
This handy flow chart will help you decide which ability to use to maximize threat. Keep in mind that if rage permits you should be spamming heroic strike between every single global cooldown.