If you are from New Zealand the Family Services Directory has a full list of all the help and support agencies throughout NZ.
If you are from Australia the Ask Izzy Website has a complete list of all the help and support agencies throughout Australia.
Outside of NZ try Googling 'Depression help in your city' or 'Support groups for Depression' or 'Suicide Hotline in your city'.
If you really don't know where to find help, try a GP, they will be able to tell you about all the services and options available in your city.