Ahh, okay! I think I got it now 
Probably I will need to order more parts as you said, but I'd like to get as much as possible in the first go since the delivery time is about four weeks to Sweden, but it's a fifth of the price 
Theoretically, if I need eight motors, not that it will be needed in the near future but anyway. Can I connect several motor-shields on top of each other? And if yes, how will I be able to control the motors separately?