This query comes my way all the time, in assorted permutations. Basically, it's a variation on the theme of "how do I make it?"
This is obviously an endless discussion. The methodology of promoting or selling oneself or one's music changes quickly and violently, right along with the advent of new social networking protocols, this week's flavor of music delivery website, etc. etc. ad nauseam.
Well, there's now a cool treatise on NIN.com from Trent on getting thing going as a new and/or unknown artist these days. Have a read; it's clear, concrete, and hopefully will give you some ideas.
http://forum.nin.com/bb/read.php?30,767183,page=1
I hope it's at the very least a validation of something you already know. Ultimately, rely on yourself. As Trent just mentioned to me on the bus after posting: "Nobody ever held my hand and showed me how to make it." Fair enough. Same for every other artist of quality that I know. The context of our conversation being: just do it. It takes fortitude, intelligence, drive, and quality. Have the hunger, put everything on the line, make music that paves its own way and doesn't bite trends.
Potentially most importantly: Make music that, under honest and direct scrutiny, doesn't suck. Seriously!
Best,
JMJ