Hey Bribie,
I've ordered the culture from the same outlet recently, it's good stuff. While you're at it, culture some other veggies up as well, not just cabbage. It's great as a side dish to any meal.
They have instructions on the website, and if you get a chance to chat to the owner David it'll be well worth it, he's full of knowledge on the subject and spins some good yarns, too.
Got some yoghurt and probiotic cultures as well, together with heaps of other useful stuff.
If you were still up here I'd bring you some to the next BABBs meeting, but hey, you ran away so what can I do...
And yep, you're right about the brewing danger, am a bit paranoid about it myself.
As already pointed out, Kaiser Soze is the go to man here on the forum.