Hello Murad,
I agree with Stumpy. Firstly the biggest island within the Cook Islands is only about 10 kilometers long with about the same width. Economic mismanagement has resulted in growing unemployment and a massive foreign debt. Compared to a population of about 11,000 that lives on the islands, there are about 30,000 Cook Islanders living in New Zealand and another 10,000 in Australia.
Immigration laws are extremely strict and about the only practical way of landing on the islands would be for a short visit and you will need to have hotel reservations and evidence of cash funds for the duration of your visit. Changing your status from visitor to resident is virtually impossible. Even New Zealanders have difficulty staying in the Cook Islands for more than a short period.
While in New Zealand I met several Cook Islanders who had the same opinion that finding work in the Cook Islands can be quite a challenge. The government there is very keen to keep the islands for it's own people and to keep foreigners out, except for visitors. At best, The Cook Islands can be seen as an exotic and expensive holiday destination.