Hey dudes, I only hv Dbol in me. Just by using Dbol only cycle will I gain and bulk up?

yea, you will
Will I bulk up? Depends on what u eat, how u train, how much cardio you do, how much Dbol u use, etc etc etc.
no offense, sounds like u should have read a little about what you're taking before jumping.
You may be dissapointed, you may lose all that u gain, you may get some titties out of your cycle too.
mmm...I love titties.
Oh, wait a sec
[log] eat clen, tren hard
http://anabolicminds.com/forum/cycle-info/229808-log-eat-clen.html
Yea you'll be huge then your glycogen stores will deteriorate after pct because you're probably going to stop eating too
Read up. You need to do a proper PCT. Dbol only cycle has worked for many people. Some love it, and some refuse to take it without a test base. Regardless, you NEED to PCT. Make sure you read around to get all the information you need!