Pocket knife with can opener; spoon; tyre pump and tube/patches/glue. I think I could tour lightweight in good weather for days with those items plus a card for getting cash out of ATMs.

As to clothes, take as many as you feel comfortable with taking at this point. You're going for quite a while. Changing into a new set of clean gear is a luxury you will soon start to appreciate, particularly knicks. If you start minimal, you also can top up with Goodwill (Salvos/Red Cross in Australia) recycled clothing shops.

I usually take three pairs of knicks, plus a pair of unpadded bike shorts for later-on, three pairs of socks*, and three jerseys, plus a pair or two of overshorts. Might seem a lot, but it does compact down in a light dry bag or two. Clothing when it's cold is something you don't compromise on in Tasmania.

* There is a theory you can get by with just three socks -- two on, one on standby; next day, move the order across -- left for washing, right to left, standby to right. Repeat every day. I've never tried it. I like *both* my feet clean and comfortable, too.