you can take KMB bus No.68M to Tai Lam Tunnel and change KMB bus No.69M to Kwai Fong Rail way Station bus Terminus
Get On Point:元朗(西)總站,元朗同樂街,元朗谷亭街,新元朗中心 or 東頭村
Interchange Point:大欖隧道
Get Off Point:新都會廣場
Fee:$8.8
Times:45-50 mins(not included the waiting times and walking times)
The first bus to Kwai Fong Station will be leave at 05:25 a.m at Tin Shui Estate Bus Terminus
KMBbus No.68M information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=68m
KMBbus No.69M information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=69m
Hope above information can help you!