Join online writer communities for advice and support. The authors in these groups genuinely want to help you.
Just start typing. The first draft may seem like garbage, but it gets all your raw ideas down on paper. There is plenty of time to rewrite, polish and get advice from trusted sources after you reach “The End” for the first time.
Don’t rush to market. When you think you’re done rewriting, put it down for a while, then rewrite again. There is a saying that you can’t edit a blank page.