I don't think you'll find a better community than HN. These topics might not seem to be on the front page much but if you post a question about a specific issue I'm sure you'll find plenty of experts offering their advice.
I agree. There are a lot of small business, marketing, tech, etc forums around but HN is a cut above. From what I can see (and admittedly I'm new), the quality of discussion is way above the average. So let's hear your questions :)