I'm a bit confused on bike shoe terminology. Particularly regarding Look KEO Plus Pedals - what is required to use them?
Cleats are the bottom attachment to shoes. Most road shoes use a 3 hole attachment, which is a standard size. Most pedal manufacturers have their own cleat style, but all 3-hole cleats use the same spacing as far as I know.

Your pedals may come with suitable cleats if you're buying them new, if not make sure you buy 'look keo' compatible cleats. There is another (old) style of look cleat that is incompatible. So long as it says keo you will be fine though.