To begin ... I hope you have read this:
http://www.elitefitness.com/forum/showthread.php?t=441371
As for a dbol only cycle, this was very popular in the 60's. It is easily done with some dramatic results. It is important to understand the side effects, so please read the profile of this drug in the link above. These side effects can be emotional too.
In the 60's, daily mg dosages were very low. I can remember taking one 2 mg of wini at each of the three main meals and thinking I was big time. And I experienced changes. dbol dosages were as low as 10 mg a day.
Today, dbol is usually one of three drugs used in a stack with injections. But let's just answer your question and not tell you to inject.
As a first experience, go slow. You want to feel the effects both positive and negative without getting in too deep.
The leading dbol is naps and they come as 5 mg pills. I would recommend one 5 mg tab with each of 4 meals. That is a total of 20 mg a day and 140 mg a week. Do this for 8 weeks. I'm doing this now and have gained an easy 12 pounds. A lot of this is water.
Others will say 50 mg a day, but if you start to bloat up, get zits and your hair starts to receed, you'll need to back off.
Your liver will suffer as well as your prostate. This will pass when you stop and go back to normal. You should be able to keep 50% of your gains.