Few Beginner fishing questions?

So I have recently taken an interest in fishing and want to get started in the Napier area. I am not sure of the costs involved but would like to spend around $100 if possible.I will likely fish probably once a month for a few hours or so...

I am considering fishing in the mouth of the river from a wharf point, or anywhere else within say 15min car journey from Napier.

I ultimately am looking to cook and eat the fish I catch, so just the tasty ones to keep.

What setup would people advise - bear in mind my knowledge is limited for this. I noticed in Kmart there are a range of rod/reels for around $50 with varying sizes. I'm not sure what significance the rod size has or if these rods are even acceptable for a beginner.

I also don't know what weight/hook/float to get - apparently there are Gurnard, KY and lemons in the area...

Lastly but probably most important, what license, if any do I need to sit at the river mouth/sea and drop a line out for a couple hours or so a month?

Any help gratefully received.