I want to visit honkong for 2 days. I want to go to Macau for a day, not spend a night in Macau but leave for HK.

how should I travel from Macau to HK ?
Till what time in the evening can I leave for HK
Suggested 2 days itinerary in HK.
Is HK better for shopping or Guangzhou as I will be coming from Guangzhou.
If I do not do any shopping then how much money should I get converted from rmb.

Thanks