Dont go on dbol for first time user especially with your body fat % the aromatization side effects are very underblown since you are a first timer you have no idea how your body reacts to compounds you may be highly aromatizing or not and with real dbol you dont want to touch that yet, i would suggest looking into a less aromatizing oral if you still want to do a kickstart maybe tbol or superdrol(very harsh but effective) for the big boys.
To keep the test stable you have to pin twice a week i would do it monday and thursday in the morning that is when blood is most stable in your body.
12 weeks is fine wait 2 weeks then pct with nolva 45/45/25/25 or clomid i dont use clomid so i cannot tell you the dosages myself from experience.
If you decide to take test only you will make good gains if you have good diet and training around 12-15 lb 8-9 keepable muscle gains maybe more.
Also watch your AI have some aromasin on deck maybe take 12.5 e3d just to see how your body reacts, if your nips start hurting a lot then up aromasin 20mg ed and see.