Although I haven't published a novel, I have read quite a few books in my time. Chapters there can be very long and very short. Books can be long or short, published or self-published. What matters is the story and the characters, pacing, style, etc. Not word count. I read your first chapter and it's not bad. It's a good start, what you can do is read all kinds of authors with different writing styles, I read Tolkien, Hemingway, Lovecraft, Dickens, + a few more. That will make your brain see things differently and you start thinking about sentences and word order differently and better. All in all, your writing wasn't bad. It was short, yes, but not bad. I'd say keep on going, as coming from personal experiences, start it out as a hobby so you don't have the pressure of getting paid on your, because that will sap much enthusiasm. If you got more questions, go ahead.