I want to travel from Guangzhou Airport to Zhuhai. Please advise which shuttle service will help.

The transportation is quite convenient. You can take the direct coach from the airport to Zhuhai.
There are two routes:
1. Gongbei Line:
Destination: Yongtong Hotel, Gongbei Coach Station,No.1 Lianhua Rd
The operating hours are from 8:00 to 0:20 next day. The trip takes around 3 hours. The ticket fare is CNY 88 per person.
2. Doumen Line:
Destination: Doumen City Terminal Building
The bus schedules are from 9:30 to 21:30.
The duration is around 190 mins. It also costs CNY 88 per person.