I will be reaching Hong Kong airport at midnight. How can I get to my hotel in central?

Airport Expres is the best way to go and its last train leaves at 00:48. If you can catch that, get off at HK Station (25min). Walk through the underpass to Central and move to your hotel within 10min.

If you would miss it, take overnight bus no. N11 and get off at HSBC Main Building, Des Voeux Road Central. Then walk to your hotel (or tell me the name of your hotel). The bus is in service during 00:50-04:50 at intervals of 30min. It takes around 70min and costs 31HKD.