RE: 1st Dianabol cycle
Good advice above.
ProMan - igore your friend completely - he sounds like an utter numbskull if he thinks its a good idea to use steroids after 4 months training. Hell, after 4 months training I was still learing how to execute good, proper form in my lifts. He will also undoubtedly be oblivious to aromatisation issues from dianabol so you might end up with a rack to rival Jordan's before you know it.
As said, visit the diet forum to sort yours out and nail the training hard for at least 2 or 3 years - you'll find you will make amazing progress in the early years without even thinking about steroids.