I recently started DWC and have been using hydroton. I have read that some people have actually grown in just hydroton, but not recommeded. Using soil in a DWC will not work. Go buy a 3inch net pot they are about 2.00 max and fill it with hydroton or something similar (I may be super wrong but I read that someone used gravel like what is used in playgrounds, but I have also read that the sharp rock edges may damage the roots). You have the idea down just need to use a different medium, soil will no work. A platic net pot will work perfect.
You also have to make a light proof resivor dont not let any light get into the res. and put an air stone on the end of that air hose they are about a 1.00. You will eventually need a much larger res. a 3gallon buket eventually. You will also need some kind of nutrients solution, to feed them. But use plain tap water till you have about 3 or 4 sets of true leaves.