Similar to yesterday's "Ask HN: Share your profitable side project" <a href="https://news.ycombinator.com/item?id=22396721" rel="nofollow">https://news.ycombinator.com/item?id=22396721</a> and the popular "Ask HN: One-person SaaS apps that are profitable?" <a href="https://news.ycombinator.com/item?id=19701783" rel="nofollow">https://news.ycombinator.com/item?id=19701783</a>
Focus on making something useful for your users. Don't have high expectations of profits immediately. Focus on making it a good product, and hopefully the users will come, followed by some profit after that.