Hi,
take a closer look in this category, there's heaps of people who commented on how to structure the competency stuff.
As to your other question:
You register once and that's that. Then you have to apply for an Annual Practicing Certificate (APC), about $240,-. This lasts for one year (cycle: 01.04. - 31.03. every year). Once you have got it, you will have to apply every year to remain on the register. The NZ Physio Board has got requirements you'll have to fulfil to keep your registration ongoing, and they audit several candidates every year. It's not too bad, though. Just like keeping up a detailed PDR.
The Physiotherapy Board of New Zealand > Recertification
The Physiotherapy Board of New Zealand > Annual Practising Certificate

Hope this helps a bit.
Cheers,
Fyzzio