Brownell's has a LOT of good info and all the tools.
They also have a VCR tape on checkering.
THE great classic is Monte Kennedy's "Checkering and Carving of Gunstocks".
This not only shows everything known about it, it also has full-sized patterns and techniques, tools, and distinctive styles done by other famous craftsmen.
Checkering, particularly in simpler styles is not hard, and is mostly learned by practice on scrap woods to learn the technique and skills.
Tooling can be fairly simple, and you don't need a big outlay in equipment.
Basically, a good Opti-Visor magnifier in your choice of focal length, a good adjustable bench light, some type of adjustable vise, and a minimum set of checkering tools in the lines-per-inch you want to work with.
Extras are a couple of wood "riffler" type needle files and a stiff toothbrush, and your good to go.