How much from International Commerce Centre (ICC) to Tsim Sha Tsui Star Ferry Pier by MTR and 5C?

1. As I know, 5C is a bus.
2. Take Tung Chung Line from Kowloon Station to HK Station. The duration is 15min. It costs 10HKD per person. Then take a ferry from Tsim Sha Tsui - Central Pier to Star Ferry Pier directly. It takes around 10mins with the fare of 2.7HKD per person.
3. Yes, you can use Octopus Card.
4. From the pier to HKIA, you don't need to take bus no.A22 or 1A. Just take bus no.A20 from Silvercord to the airport T1 directly. It costs 33HKD per person. The duration is 75mins.