Here are some things I did to set up the business and how much they cost me. If I was on a tight budget I wouldn’t have done most of these things, or found cheaper alternatives. But nonetheless, I think this info can be useful to anyone going through the same process.
Look at @automattic for a good example of sound OSS business execution. They have thousands of competitors using their own software, but is it harming them? It doesn’t look like it. I bet the competition helps them in the long term.