Now that it's not 6 am and I have more time I give you a few thoughts...
You will want to keep the temp down to a max of 20 deg as if the water is above this it is stressfull on the fish. Higher temps mean less O2 in the water for a start and most of our natives are much better suited to lower temps. Under forest cover streams seldom get above 15-18 deg.
Most natives will take dried food eventually, some learn quicker than others. You will want a high protein food. I use NLS sinking pellets 2mm, Sera East-African cichlid pellets (about 2mm), Nutrafin Max Cichlid (about 1mm) and Discus (about .5mm). Use the right size for the fish etc etc... the NLS stuff sinks very fast and can get lost.
Any small stream should produce fish - the whitebait season has ended so make sure you aren't catching fresh run whitebait. The best way to catch fish is by spotlight at night - ask landowners and no reserves etc
I would suggest common bullies, Cran's bullies, inanga and banded kokopu. smelt should do ok but need high O2 when transporting them and in the first 24 hours or they will die, once settled thy are easy to care for and hardy enough. Other things to think about are freshwater shrimp (will end up as food if you keep kokopu) and koura. eels will likely wander off from the pond...