I guess at least its good you took the time to post here and ask bro. Sorry for being a dick but c'mon man, how long could you have possibly been reading up on this. This is basic ****.
DBOL should be used as a kicker 4-6 weeks (max, its hepatoxic). Deca needs to be run for AT LEAST 12 weeks to get results. And you need to run a ****ing test base (with Deca / DBOL that means you are best looking at a long estered test like test cyp or test e).
Finally, you need to have an aromatise inhibitor (arimidex, aromasin, etc.) on hand, as well as clomid or nolva for PCT after your cycle. You need to do some freakin research before you touch that **** bro.
Unless of course your goal is to kill your dick and grow tits.