Grab a cutting from a neighbour or your Mum, swing by your local nursery (or even look for seedlings at your supermarket), or jump online and order something. It doesn't matter how you start, just plant one thing - trust me, it feels good!!
If you're keen to find out more, check out:
Edible backyard and Blue Borage: Great gardening resources and workshops.
Awapuni Nurseries: Online package free seedlings
Kings seeds and Koanga: Heirloom and organic seeds