Welcome to the club @poleronepeix
Congrats on taking that first step. That's the easiest part about starting a webcomic.
Now here comes the fun part. Building and maintaining an audience. The first tip I'd like to give is that no, you won't become popular overnight, but I imagine you probably already knew that huh?
Anyway, tip number two is build a buffer. The easiest way to go about doing this is to take a break from working on your comic for a while that is tell your audience you'll be going on hiatus for awhile to build up a buffer of new pages so that you can better concentrate on other things in your personal life. I'm currently building up a buffer for the next chapter of my long form comic Life of an Aspie as well as a buffer for the art overhaul I'm also doing for the entire comic up to this point. (More on that in a bit)
My third tip for starting a webcomic is network your butt off. Especially early on, connecting with other creators here on Tapastic who are on the same page as you will help make getting subscribers for your comic that much easier. What I mean by that is, engage them like you would a friend. Leave fun comments on their comic, offer them fan-art out of nowhere with no strings attached and basically talk to them, not at them. Being active on Twitter particularly on the weekly events Webcomic Chat and Comic Book Hour which both host weekly questionnaires for all web cartoonists to answer can also help build your audience.
Lastly, improve your comic. Especially once you have some regulars constantly engaging with your comic, the time to network while not over needs to be put on the backburner in order to better focus on what your comic really needs long term and this leads me to my next point. Imagine if you will that you run a small burger diner and that you make just enough money to stay afloat and pay your bills. You have a few regulars who frequent your diner, but you can't help but feel there is something you can do better. To make matters frustrating, your arrogant rival across the street who also has his own restaurant seems to have no problems outperforming you month after month.
What is his secret? Is it the fact he has widescreen televisions and you don't? Is it the fact he has better business acumen than you? No and no. The real secret behind your rival's success has nothing to do with how much money he can dump on advertising his restaurant or how much more he allegedly knows about his profession than you do yours. The real secret behind why he's doing better than you instead has everything to do with the quality of the product he's offering.
In the often times unprofessional world of the webcomic industry, the majority of comics you see are often made for the authors own amusement or because the author has seen the success of comics like Penny Arcade or One Punch Man and wants his or her own slice of that good life pie, but lacks the skills (and luck) needed to make it happen for them mainly art wise though it should be said that great art isn't always the be all end all for which comics sink and which ones swim. Any comic could have pretty art, but a terrible, terrible story that repulses even those with tempered palettes.
Likewise, comics with lacking art can sometimes be rescued by good writing though if the artist polished their craft more, they would have a much easier go with building an audience since inevitably, webcomics like any other medium are all based on first impressions and the truth is that its much much easier to get say 200 subs in a month if your comic has a clean colorful look to it as opposed to to something that from the viewpoint of the reader may as well have been made in MS Paint.