There are so many variables that need to be considered.
- do you want to self drive, bus it or fly
- do you want to go to NSW, Vic
- in snow or off mountain accomodation
- private lodge or commercial
- self catered or fully catered.
My advice for a first time experience is to go with an agent as there are too mant pitfalls, and you do not want your first experience to be a bad one.
I used the Ski Connection for many years and found excellent service there.
If you want more advice, let me know (I skied for 30 years at Hotham, Falls and a little at Buller and Perisher)