for a first time steroid user i would rather they stay away from any fast acting products so they get a true feel for how the injectible ones work. besides that you really will not see anymore total gains if you add the dbol than if you just give yourself a few weeks to allow the long estered injectibles to hit max bloodlevels.
what i recommend during that 3-4 week timeperiod till the injectibles kick in is to gradually increase your nutritional uptake so by the time it will be needed around week 4 you have hit your highest food intake amounts. this will help to keep off some of the fat that people gain in the first couple weeks of a cycle before the steroids kick in.
save your dbol for your second or third cycle, keep the first one as simple as possible so you can learn the most from it yet still make gains, and also know where they are coming from.
if dbol is used early in a newbie cycle you will see gains and think everything is fine when in reality all it will probably be is waterweight so you will not know if your diet is high enough. follow my suggestions and it allows you to ensure everything is up to snuff during your first cycle learning experience