HK pre-registation will allow to enter Macau for Indian nationals

Hi,
Me and My wife are travelling from India to Canada via HK, We will stop at HK airport and go to Macau throw Ferry. One day stay at Macau hotel and back to HK. Will stay in HK for 2 days at hotel. after 3 days will fly to Canada.

I will take HK pre-registation, however

My questions are?

1) Do i still need to take Macau visa?
2) If I re-enter do I need another HK pre-registration?
3) Any other suggested documents / paper work to make this trip happier?

Thanks
Laxminarayana