I am an Indian citizen wanting to visit HK for tourism

I have 2 questions
- I am an Indian citizen wanting to visit HK for tourism purposes and then fly out to Melbourne for further tour
1. Do I need visa. I plan to stay for 3 days to do some local sight seeing
2. When I exit and want to board flight to Australia, do I have any issues with label-less electronic visa issued by Aus.. I see that there are some restrictions on it when one travels from Mainland China to HK and breaks journey in HK.