You should do some more research. Naposim is very good stuff but at 20mg/day you are shutting your HPTA function down *for 8 weeks*! Thus a 10 lb. gain might turn into a zero lb. gain after the cycle (as you always lose some after).
The only sensible way to use dbol only is to go 2-3 weeks at 40-50 mg per day. Your endogenous testosterone should not be too badly suppressed and will kick back in quickly.
My first "cycle" ever was 50 mg/day of Russian dbol for 2 weeks only. I packed on about 10 lbs in that time and kept 7 or so. I suppose that sounds impossible, but the pumps were incredible when I did this and the weight gain pushed me thru previous plateaus.
However, I wouldn't recommend this half-assed approach. You need to do more research and plan a proper cycle, or not do it at all. Creatine alone can help you progress naturally.