Zhuhai visit

Hi, I would like to visit Zhuhai in November with my spouse who is not so healthy (we are retirees) & need advice on :-
1) Could I fly to HKg Int'l airport and take a ferry service directly from the airport to Zhuhai ?
2) Do I need to retrieve my luggage and check out at the immigration before proceeding to the ferry service terminal ?
3) What is the process ? I called SIA today and they are unable to provide any information ?
4) As a Singaporean, do I need to have a visa to visit Zhuhai ?
5) Is it a good timing to visit Zhuhai in November ? Cool weather ?
Any additional pointers will be greatly appreciated.