There are three options you can look at here.
1. DIY – as per the link above SquareSpace or Shopify (if you need eComm) are the leaders here. To keep it local you could look at https://www.swiftly.nz too. You can do it for free but be prepared for this to take time.
2. DIY with help – you can again use these sites and get someone to guide you – help with the structure, design, and implementation. Be prepared to spend 5 to 15k for the help.
3. Custom Build – here you are moving to WordPress or Magento (you could still use Shopify) – for local options look at Silverstripe or https://www.solutionists.co.nz for eComm. Here you are jumping up to 40 – 150k plus. The difference here is we are talking custom design, animation, bespoke content – photography/video, copywriting, more features, integration etc. Think of this as the equivalent of opening a store.
To decide which one is right for you – you need to make a list of the features you want and match those off against what the platform offers. And make sure it’s a well supported and popular platform.
Best of luck!