I'm also growing DWC at the moment.
I am using Earls System.
CC Hydro 101 by Earl - Cannabis Culture Forums
DWC, Bubblin' Buckets, What's Needed And How To - Cannabis Culture Forums
Read these two threads. They are simpley brillant. I have been following these instruction and have so far had no problems.
There is a lot to think about in DWC, you will need to spend 30mins per rez each day and you will need a bit of equpment, it's pretty much all covered in those articles but a couple of things I would make sure you have are.
An enzyme (these really help keep your roots healthy)
Two air pumps per Rez
Some way of keeping your REZ at a cool 68F, very important.
Here is a pic of my grow a couple of days ago.
There are 8 clones in this pic, they are 27 days into flowering.
PS. although I have had really good results with DWC, I am going to try Ebb and Flow for my next grow. I am going to do this because DWC takes to much metanance, and I plan on being away for the odd weekend during the summer months.