What's the best way to advertise a web comic?

[DecreeB]

I started a web comic less than a month ago and upload weekly (excluding weekends for now). We've already got 300 likes on Facebook (which I understand is actually a fairly quick growth rate), and a couple watchers on DeviantArt, but it seems like they aren't the best methods for advertising freely. I use GetWatchers, but it seems no one on there is really looking to watch people, they just skip through every photo without doing anything. So my question is what is the best FREE way to advertise a web comic, and what's the best (free/not free) way to advertise?
I've noticed some available ad space at my local malls, and even some kiosks there, too. But I'm not sure if that'd be a good way to advertise. I've been thinking about starting a website, but they can be expensive (also, where's the best/cheapest place to make a website?). I've also been thinking about paying for Facebook advertisement, but I'm not sure how that works or if it even helps get fans. If I start a website, I might also use Google AdSense, but I don't know how that works either.
So if anybody knows anything about these subjects, PLEASE fill me in! And you don't have to answer all my questions, but the more the merrier!
PS I prefer to leave the name of my comics out since I feel it wouldn't be right :/