Let's get one thing straight right away... there is no magic bullet that's going to take you from 10 unique visitors per day to a 1000. I was at a Comic-Con forum where Gabe from Penny Arcade was asked what the best way to get internet traffic was. His response was something along to the lines of "Invent a time machine and start your webcomic in the late 90s." I've heard a number of responses from creators that are along these same lines.
The chances of you ever making your living off your webcomic are just about non-existent. It's not impossible but almost all creators out there today making a living off their comic have been doing it for 10-15 years. The point I'm trying to make is that there are a lot of great reasons to do a webcomic but don't let making money be your reason because you won't put out a good comic and certainly won't make any money.
I'm going to do an entire series on Advertising that should give you a fighting chance to get a few hundred visitors a day for a price that will fit into any budget. Next time I'll talk about creating effective banners that will draw traffic to your site.