Hi,
could you please explain what you mean with "depth" ???

There's heaps of information on this website already and all the basics + competency requirements/ evidence suggestions are on The Physiotherapy Board of New Zealand > Registration - Overseas-Qualified Physiotherapists

Minimum standard is a 3 year BSc Physiotherapy degree with additional 1 year full-time work experience as Physiotherapists.
The competencies are listed from 1-10. They are basic Physio competencies, which should have been covered by your degree, too. I would start with competency 1.1.1 and go from there.

Where did you train?

Cheers,
Fyzzio