How is the job market?[]
First check out the government run Careers.govt.nz website, especially the Jobs Database . This has good coverage on most jobs in New Zealand, both skilled and unskilled - and has important info such as the labour market situation, any training/educational requirements etc for New Zealand.
For online job listings for skilled labour, check out TradeMe Jobs and Seek. Unskilled labour will be advertised on shop doors, in local newspapers or more generally via word of mouth.