1981 and newer Club Car Golf Carts have their serial numbers just under the glove box on the passengers side of the cart. The first two numbers (not letters) indicate the last two digits of the year of manufacture.
1981 and older Club Cars have the serial number under the seat on the frame section closest to the batteries on the driver's side of the cart.
You can buy the manual from any Club Car dealer or online at buggiesunlimited or golfcartcatalog...