Please tell me best way to go from Baiyun airport to Hongkong airport as I have 1 heavy luggage.

I'm afraid no direct bus is available. Here is my suggestion:
Take airport shuttle bus line 5 to Haizhu Plaza, which is about 500m from Guangzhou Hotel. So you can ask the local people about the direction and location of the hotel. There are cross-border buses running from the hotel to Hong Kong Airport directly. The bus schedule is at 06:50, 07:00. 07:20. 07:10, 07:30, 07:40, 07:50, 08:40 and 14:00.