There isn't a single author community, but Making Light has both editors and authors as hosts and commenters.

If you want to make some personal connections, it's a good place if your personality is a good fit for the community. (Translation: I'd call the community informally rationalist, with a high tolerance for religion. Courtesy is highly valued.)

I looked at the beginning of your novel, and the prose is engaging-- I think it would appeal to people who like Heinlein.