We're planning to visit Macau on Feb. 12, 2013.

The Central Ferry Station, do you mean the port near Sheung Wan?
If so, it is not suggested to go there to take the ferry. The closest ferry to Macau in Kowloon is China Ferry Terminal. Since I cannot figure out the exact place of you on Nathan Road, I suggest you to take a taxi to reach No. 33, Canton Road where you can find the China Ferry Terminal to take the ferry to reach your destination.

To reach there, the ticket fare is 151 HK$ and for the back forth it is 139 Hk$ during weekdays for the common seats and during day times. There are VIP seats and first class seats and you can go to see by yourself. I am not familiar with them, because their prices are high.

For one day trip, Senado Square, Ruins of St. Paul's, the Museum Of Macau, Monte Fort, Macau Tower and A-Ma Temple are suggested.
The Macau Tower and the museum are charged, but all the others are free.