Congratulations! It is such an exciting/overwhelming time

I had a VBAC with our twins. They arrived at 35 weeks, and spent a little bit of time in the special care nursery but are now 19 month old thriving, growing, cheeky little chatterbox monkeys! I think one of the factors in v/birthing twins is finding a supportive ob or hospital. My ob is very pro vaginal birth - so much so that he talked me into it, as I was pretty set on having another c section. I see you are in Vic, so to give you an idea, I birthed at Warragul Hospital, but the girls were transfered to the special care nursery at a hospital about an hour away (closer to the city) and most of the nurses there told me there was no way the hosptial would of 'let me' naturally birth the twins there.
Our birth was pretty amazing. I had an epidual which I think might be standard with a vbac. Our ob just required one baby to be head down, which they both were (they turned when I was 32 weeks).

As Tarhli mentioned the Australian Multiple Birth Association (AMBA) has a great website and also a really good Facebook page.

Good luck with everything - hope you are processing the news ok!