So I'm pretty sure other people are gonna come in with really good standard advice but I wanna share a technique that I've been using that's worked fairly well? I think?
So I make a lot of minicomics, and the benefits of minicomics are 1) they're pretty easy to make 2) you can use them to ease people into larger projects 3) they're stupid cheap to print.
Making comics that can be printed as 1-sheet-zines are particularly useful because they sorta function as business cards that people actually want to keep or will give to their friends. Heck, they act as business cards that you can sell to people.
Bad influence is one the comics I used this tactic for, and I think I figured out the format pretty well with this one - I haven't done much distribution of this zine yet, but I'm pretty sure once I do I'll have a small occasional spike in readership among my comics as a whole. That's what happened when I distributed my other minicomics anyways.
@revisionstudios uses a similar method, except they break down their series into "issues" and "trades" similar to a traditional mainstream comic book. They run kickstarters to produce these and from what I know a large portion of their audience comes from distributing these books at cons. (I have yet to do a convention but I'll be doing my first later this year :V)
It's also worth mentioning that I'm not a complete sell out - I like the challenge of making comics that fit into this format, and they're such short projects that I have the freedom to experiment with them a bit more than I do in my larger projects (or heck even my larger minicomics).
So YeAh. I'd recommend giving this technique a shot.