Compost is really critical for any vege garden, I'm no expert in the composting field as I usually get mine from a bag. I do however plan to get a compost bin going in the summer.
If you want help composting there are great teachers out there like Katrina from Blue borage www.blueborage.co.nz. Katrina is a Titirangi local and can teach you a lot about home composting. If you fancy doing a bit of reading then I've found a few great resources.
Bunnings Warehouse step by step guide