I missed half of your post. Sorry.
Polarizers are easy. Basically there are lots of types, but they just get better and more expensive. There are little tradeoffs. Just get the best for your budget.
1 - Try to get a circular polarizer. This will allow you to change the camera orientation (and on some lenses focus) without ruining your polarizer settings.
2 - Get a multi coated polarizer. this just makes the filter more effective.
3 - Buy the filter that has the correct diameter for your lens. The lens will say what size you need right on it. Usually something around 68mm, 72mm, etc..
One good CP does all you will need.
Basically, you will thread the CP onto the front of your lens. then, frame your shot in the viewfinder and grab the polarizer with your fingertips.
Rotate the front element of the polarizer and watch the results in the viewfinder. Snap the photo when you like what you see.
A CP can perform the functions we have spoken about here in regard to automotive photography. It can also be used to make skies bluer (cut down reflection of sunlight off of water vapor in the air).
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