At the same time, perhaps this is the best time to give advice. Newly-published and still feeling the thrill of being called author, there are indeed some things I'd like to share. So, for what my advice is worth, here goes....
1. Don't listen to advice on how to write. Just write. The best writing seems to come from that 'zone' somewhere within you. Set up your best writing by finding where you're comfortable, what time of day you're most prolific when it comes to writing, what you want as background noise (or silence), and hit the keys or pages. Find your zone and then keep at it.
2. Listen to advice on how to write. Yes, you have a unique voice and commas are not the be-all-and-end-all of writing. e e cummings would be the first one to tell you that. They do make a difference in what you say, however. We've all seen the memes on FB about comma placement. They are funny for a reason. Grammar helps you say what you mean to say and avoids a lot of confusion. You know that sound when a needle is pulled across an old record album? That's what I hear in my head when the flow of reading is interrupted by bad grammar or poor editing. And doing your own proofreading isn't easy. Since your brain knows what you meant to write, it sees that and not the mistakes. So, get yourself a qualified proofreader. Short of that, read your work out loud. It's a great way to catch your own mistakes.
3. Pre-publication readers. Yes, do this. Grab a couple of people who a) read a lot and b) have your best interests at heart. Ask them to read your book and give you honest feedback. What you are seeking here is readers who will catch any continuity errors, grammatical errors, stilted writing, etc. They need to be readers who not only love reading but love you enough to tell you the truth. And, you need to hear what they have to say.
4. Choose a good site for self-publishing, if you decide to go that route. I use CreateSpace and have been very happy with not only the quality of the finished books but also the ease of the process. There are templates to make formatting your book simple (well, simpler) and forums to get advice on everything from writing to marketing. From there, you can format your book interior and cover, set it up for sale on Amazon as both paperback and ebook, and order copies of your own to sell.
5. Take the time and care with setting up your book that you would with anything else you do that is important to you. Do it right and you will end up with a beautiful bound copy of your work. Rush it and don't pay attention to details and you'll end up with, well, a poor version of your work. Which would you rather have?
6. Market! You have to be your own agent. Post, tweet, share, and get your butt out there to share your book in person. At first, it feels strange and a little frightening but, believe me, it's worth it. There are a lot of schools of thought on giveaways, free book listings for a limited time, and other marketing techniques. The most important thing is that you use a lot of different methods to get your book 'out there'.
7. My last advice? Do it. Write it. That book won't write itself. And let me know when you do!