Long Stay Visa Permit

Hi all.
Me and my friend are coming out in May, we are aware with the tourist visa from the airport we can only stay 3 months in one go, and hopefully all working out, we would like to stay longer than this.
I have been reading up on residency and its somewhat confusing.
Do you have to apply for residency for up to a year, or can you just get a 6 month residency permit, as that would most likely be the length of time we want to stay.
Thanks for any help in advance
Me and my friend are coming out in May, we are aware with the tourist visa from the airport we can only stay 3 months in one go, and hopefully all working out, we would like to stay longer than this.
I have been reading up on residency and its somewhat confusing.
Do you have to apply for residency for up to a year, or can you just get a 6 month residency permit, as that would most likely be the length of time we want to stay.
Thanks for any help in advance
