with dubstep, a way you can make is have your intro down etc etc. then after 16 bars start your build, take out all the kicks or even all the drums, and just leave the synths playing, with some whitenoise 'sweeps' after 8 bars start to make the synth's rise in pitch, and bring in a kick build...like have a kick every 4 beats, then make it quicker to 1 every 2 beats, then to every beat then to every half beat, every quater, getting faster and faster etc etc. then on the 31st bar bring everything to a silence drop in your vocal hook or just have a real loud punchy snare snap on the 3rd beat of the 31st bar and then drop the bass on the 32nd making a nice 32 bar intro *around a minute understand?