I have to catch a flight from Hongkong at 9.30 I have to come from Guangzhou What is best way

Since your flight is so early, you'd better go to HK the day before. You can take train from the East Railway Station to Hung Hom, or take the cross-border coach from Haizhu Square area to Kowloon, HK. Then stay overnight in HK and take taxi or shuttle bus to the airport the next early morning.