I think it's not bad for a first attempt at dubstep, but there is room for improvement. It's missing some dubstep elements, like JustALunaticGuy mentioned. I also think you could add a bit more to the drop.

I love the first part of the song, its pretty chill. The most notorious issue is that the snare is too loud in relation with the kick, i also like the pluck at the background, sounds perfect. but why this is Dubstep? it's missing the most important element in a dubstep track, the BASS, the heavy and sometimes distorted bass.