Simplifying Commercial Software Development?

NerdOfPrey writes "I'm nearing completion of development and testing of my first self-produced commercial application, but just beginning to appreciate the full bevy of other associated tasks ahead. There are help files to compile, end user license agreements to write, a website to create - and a secure online payment system to identify and integrate, automated installers to build, logos to design, marketing, and so on. Are there any good web-based single sources of information covering these sorts of issues? I've never had to do all of these things myself in the past; a comprehensive 'small developers guide' would be of considerable benefit." So is there anything besides "imitate, guess and pray" for all the tasks that come after the app is written?