When you are new? Forget it. Be patient and if you are ready to work for your dream for years to come then maybe.
I would suggest that you get a job that doesn't drain you too much mentally or eat your spare time (so preferrably nothing that requires a long expensive education) to keep you afloat while you work your way there. When working towards your dream, be sure to work a lot on improving your speed. If you want to make a living as a webcomic artist, speed is king and art is queen. Writing is the food they eat. Basically it's your least marketable skillset so don't get caught in a "the story's the most important part anyways!" mindset because while that may be true for some readers, it is not true for marketability and will cut your carreer off at its ankles. However without properly cooked food, your king and queen will wither and die before your audience.
Make sure you obtain multiple income sources. In the art world, things can change overnight, ripping your income away or making one of your income sources smaller. I work full time as a webcomic artist, and I have the following:
- A premium comic
- Ad revenue from Tapas
- Used to get Patreon pledge from Webtoon, might get ad rev from said source instead
- Patreon
- Tipping
- I sell merch
- I sell books
All of these are important as some months things will go better or worse for one or the other, and the overall growth on them is fairly slow. Sometimes unexpected things happen, too, like Patreon's recent problems with credit card charges.
Be ready to work fast, hard and well for at least 5 years before you see the fruit of your work. Think of it like a very slowly growing bush that has the sweetest tasting berries once it does bloom.
If all of this sounds like too much, then maybe you should consider remaining a hobbyist instead. If it sounds like a fun challenge, I wish you good luck!