!Help!

So I've been working on a side project, it's intended to be sold as commercial software. I'm honestly making it because I love it's purpose, buts it's commercial because I have costs I endured while building and to keep the service aspect of it running.

Anyone have insight into issues I might have building cross-platform software, distribution, and support of a commercial product? I'm more or less worried about the "clueless" folks who don't read FAQs.