I don't have any current driving licence here in NZ, what's the steps to get new licence over Rarotonga?
Kia Orana Wafi t, welcome to the Cook Islands forum.
In order to apply for a Cook Islands licence you would need to take a practical driving test and answer some road rules & safety questions on the island. The Police HQ in Avarua undertake driver licencing. Provided you pass the examinations required, you can apply for a driver's licence applicable for the Cook Islands.
Your Cook Islands licence cannot immediately be converted to a full NZ licence. As you are aware, the NZ driving licence examinations and regulations have just become even tougher for newly licenced drivers. Driving in Rarotonga will be far less stressful compared to Auckland, and is a useful way to introduce you to driving within a real traffic setting.
If you are considering hiring a scooter, just ensure that you take your time adjusting to this type of road vehicle. Bear in mind that our island is experiencing more traffic and from bigger vehicles, so our roads still need to be treated wtih respect and caution; same as you would in NZ or elsewhere.
Enjoy your driving! Kia manuia.