Thanks everyone for your replies, im going to start using the search function today to see what i can find out.
Bob, i checked your web site and like your idea for the pvc pipe for the dock. My pond is still dry where the dock will be so it will be a little easier to put in now. I checked the price on the pvc and around here it is 2.00 a foot,im going to see what the price on steel pipe is before i decide what to use. I guess a stationary dock would be cheaper to build than a floating dock.
Thanks again