Things you will need to get for your degu:
The largest cage possible with many levels (they love to climb)
A large package of timothy hay
A large container of rodent bedding
A water bottle that can attach to the cage
One food bowl or more (some degus won't share food with others)
A Large running wheel (the goos will Grow!!!)
A carring cage (if you are going to go places with your goos, also handy for picking them up from the breeder)
Guinea Pig or Chinchilla pellets or food (Pellets can be used as food)
A large hamster ball (not necessary)