dianabol will give you dramatic strength increases so if you want to gain strength quick then get on it.
But be prepared to lose most of it when you come off of it.
PCT stands for post cycle therapy. Its a drug regime followed after coming off a cycle of steroids to assist the body in recovering its natural test production and to minimise estrogenic effects caused by the steroids taken.
Don't take dianabol until you have familiarised yourself with this.
My mate ran low dose (15mg/day) for 8 weeks and was fine and gained a nice amount of size. Slow n steady gains are always better than fast gains, as fast gains usually dissappear as fast as they got on.