- If you're looking for free info about this, subscribe to Startups for the Rest of Us (podcast) and/or https://www.youtube.com/microconf. Both have hundreds of hours of audio/video content on starting startups, with an emphasis on being a developer.
- If you're willing to spend $10 on a Kindle book, Start Small, Stay Small: A Developer's Guide to Launching a Startup (Amazon, BN.com, etc) is the book I wrote to answer the exact question you are asking.
This journey is long, but fun. I wish you the best of luck!