People have asked about this before, and whilst the basic things are pretty obvious, it has to be said at the outset that no treatment at all beats (or even gets close to) the real thing... which you achieve by smoking strong ciggies, drinking a lot of cheap bourbon or vodka - and not sleeping much. Or by being lucky, and born with that sort of voice!
So if you're not up for that, your only options are to pitch-shift your voice down (probably 5-10%) without altering the speed, and adding some distortion. The distortion is the subtle bit - you have to experiment with this quite a bit, because the amount and quality is completely voice-dependant. You will probably also find that a little EQ to soften the higher frequencies will help. Oh, and you do all of this in Audition, not Premiere.