Back when I was racing, my coach was setting me up to race the Warnie, and the one tip I can think of that hasn't cropped up yet is to try and make the time to ride to and from each race, or, even better, go on a training ride, then ride to the race, then ride home. If not every race, then at least a few. It's a great way of getting the legs used to the type of effort the Warnie will require.
Depends on how far you're away from the races that are happening at the moment, if the distances are too large then perhaps consider driving part way there, and then riding the rest. While it might compromise your racing a bit in the short term, it'll really help you survive the Warnie. I still remember racing Phillip Island and seeing guys I knew riding on the hard shoulder as we drove down, and then the same guys heading back after the race was over (though I think they pulled out with 3-4 laps to go).
And Tokyo Drifter is right, make sure you've got your nutrition sorted before the race, so you know what works, and what doesn't. Prep like crazy for grabbing musette bags from the feed zones, with the member of your support crew that will be responsible for handing you the food. Always carry enough food that if you miss a feed zone, that you'll still be able to survive the rest of the race, because it happens. But don't just rely on gels though, harder cakes, bananas, biscuits, those type of things, you're going to crave the variety over the 260kms, and you'll need to keep on eating, the amount you'll need to eat will be deceptive.
Good luck with the Warnie, it's a great experience, enjoy it. And be prepared to be completely wrecked after it - get in the good books around the house in the weeks before the race, you'll need it afterwards