Hi,
the registration gives you permission to apply for a license.
The license is called "Annual practising certificate" and costs about $250,- per annum. You are not able to work without it.
The Physiotherapy Board of New Zealand > Annual Practising Certificate
You have to collect professional development information in a portfolio/logbook, which runs on a 3 year cycle. The portfolio is required for re-certification and will occasionally be checked by the Physioboard.
You can become a member of the NZ Society of Physiotherapists, which I would highly recommend (this includes liability insurance), but this is not compulsory.
: NZ Society of Physiotherapists
Visa, or better permits depends on your age, etc. See here:
Working in New Zealand
Hope this helps,
regards,
Fyzzio