Specialized Mountain Bike Shoes Mountain Bike Pedals?

Mountain bike pedals? - specialized mountain bike shoes

With a view to buy used bicycle pedals .. I never used clip in pedals before, so I'm not really sure what you need ... Clips are supplied with the pedals and make all the clips for all the shoes to answer? I am looking for ... Shimano Pedals Shimano are clean and clips with special shoes? Information would be useful ... Thank you.