Cakey, i am! I've bought (second hand which is why so soon) a mixed few.
There seem to be two types: All In Ones (AIOs) and Nappy/Wrap combo's.
AIOs are fleece or minky inside, towelling in the middle, and waterproof PUL on the outside.
Nappies can be Fitted (look like a disposable, fastened with velcro or poppers), Prefold (look like a sposey, fastened with a pin or nippa) or Flat.
Wraps can be PUL, fleece, laminated cotton or wool (soakers/shorties look like pants, longies look like trousers)
Boosters are long strips of fabric you place strategically inside the nappy.
Liners are for catching poo - fleece, cotton or silk are washable, or tissue ones are disposable (NOT flushable, ignore the label!)
Best advice is get a mixture and see what actually fits your baby. Don't spend hundreds on kits, you'll probably find they're the wrong shape and you've wasted your money.
Don't soak them in a pail of water, you just get poo soup! Get a mesh laundry bag, line the bucket with it, few drops of lavender or teatree and keep the lid on
:)