First things first. To really enjoy dubstep you need to own a decent sound system. I really wouldn't recommend anything below the price range of $100. If you're using headphones, old "computer speakers" or your in-built laptop sound, just forget it. It'll sound like shit and you'll end up hating it. The reason for this is that dubstep relies on bass. And most cheap sound systems can't handle bass correctly. So it would be like watching Avatar on a black and white TV. It kinda works, you get what the content is about, but most of the things that make it good is lost on you.
Lets say you have a decent sound system then. What now?
Well there isn't much you have to do really. Find a good dubstep song, crank your amplifier up to 11 and have fun. Just don't forget to put the quality to 720/1080 if you're playing the song on youtube.
And if you're unsure where to find good dubstep songs, I'll just leave this here: