Not really Dubstep...
The song was inches from par for me- you didn't change your theme at all. Also, this isn't exactly dubstep- the base doesn't wobble at all... Not to mention it gets a bit annoying. With dubstep you need to modulate LFO's... It sounded from the ending like you were using FL studio (?), so look up on youtube, they have some great tutorials on how to do such.
But that aside, this was good for a first attempt, I remember mine being 1/100th as good as this here. Just keep practicing, your on the right track.