Obviously you should have waited until you could get better choices for your first cycle, but since its already said and done, try to make the best of it.
Now ... whoever says that you wont gain anything but water on this cycle is talking out their ass. Dbol mg per mg is one of the most powerful steroids. The fact of the matter is that you are going to gain both water and muscle tissue. It helps if you are a regularly lean guy with the water weight, if not expect a little more bulk.
When you come off your cycle, you will loose some of the water weight (which is a good thing), and you should keep a good bit of the muscle that you have gained (especially this being your first cycle). Just remember the basics, eat like a horse, up your protein intake from 30%. Train like a beast and get plenty of rest.
By the way people. It is not unrealistic to gain 8 lbs in 1 week on dbol, especially on your first cycle.