The student loan is an unsecured loan. You do not have to provide an asset (e.g. a house or a car) as security that can be seized if you don’t make payments.
Once you earn over a certain amount a year (the 'repayment threshold' currently set at $19,084 before tax), you must start making repayments, even if you're still studying.
StudyLink is a service of the Ministry of Social Development responsible for Student Allowances, Student Loans and Unemployment Benefit Student Hardship.