Hi Werner,
Welcome!
I am new here too, so i am really not in a position to answer any of your questions, however i am sure one of the more experienced members will.
I dont know if you have had a look at the NZ jobs expo yet? There is one on in Johannesburg on the 19-20th July, that would help you answer any questions. Not sure where in South africa you live, but i do think its worth the journey. I have family in Durban who were looking into it also.
We are planning to go to the one in London this year and have heard that they are quite good, some people even get job offers through it.
I have posted the link for you just incase :P
Opportunities New Zealand - EXP08
Regards, Caz xx