Well, general starting advice:
Set your expectaions low. You probably won't become popular anytime soon. I've been posting for about 1.75 years and I'm only at 50 subscribers.
Post often but not daily (If you can). 3 times a week is a good rate and you won't suffer from reader burnout, but once a week or even once a month is acceptable.
Post consistiently. It's better to post once a month than to post 3 times a week and then go to a 3 month hiatus.
Once you've started your comic, now you just wait (kinda).
In the meantime, look at other comics on Tapas and comment when you can (don't advertise your comic, just something witty or relating to the comic) and advertise your comics using twitter, facebook, or whatever social media the kids are using these days.
Speaking of which, my own comics:
Once you get an audience, interact with them. You don't have to make your comic interactive, just respond to their comments and think about adding in their suggestions (if you want to, livestreaming is also a pretty good way to interact with your audience).