Travel from Hong Kong International Airport to The Fountain Resort, Shenzhen, China

We are arriving in Hong Kong on September 8, 2014. How do we go to our hotel, The Fountain Resort at Xichong Bay, Kuichong Village, Dapeng District, SZ, Guangdong 518119.
We want the cheapest way. Do we go to a central bus station in Hong Kong or Kowloon and then from there take a bus to our hotel? How long is the trip?
Thank you.