How do we get out from Hongkong station to go out for a ride to Peak Tram

I understand there is bus 15 (to victoria peak and bus 15A (to lower terminus). Were coming out from HK station and would like to know step by step how to reach the bus station or if it is better to ride in a peak tram, how do we go from HK station to bus terminal of bus 15C.

Thanks in advance.