You’ll end up wasting your time and money, not to mention the damage you’ll do to yourself. Oral only cycles crash your natural production of testosterone (which is VITAL for muscle growth). The minute you come off the Dbol you’ll lose the minimal amount of weight (water) you’ve gained and you’ll feel like shit. Ending up in a worse position then where you are now. Unless you run test along with the Dbol (plus a comprehensive PCT) then what you’re proposing is counter-productive.
I don't recommend oral only cycles for the reasons stated above. Dianabol also aromatizes like crazy, so you'll want to know more about how your body handles milder compounds first. I recommend testosterone only for your first cycle