Some general tips on dubstep is that most tracks are in the tempo of 140BPM.
The drums are programmed at half tempo. Kicks can sit on the 1st and 4th, and the snares normally sit on the 3rd and 7th of the beat.
But other than that you can go quite crazy with the beat programming as long as it sticks to the half time feel.
But definitely check out the Dubstep tutorial that Rounik mentioned. Some great dubstep production tips and techniques.