Complete Instructor's training slide set, 130 slides, £50
Does it help if I can already drive a car?
It helps to some extent in as much as your perception of distances and the like will be probably be better than a non car driver. You should however, be aware that the rear wheel steering on a fork lift can actually cause confusion for car drivers!
Also bear in mind If you intend to operate a forklift truck on the public highway you will need a car licence to do so.