Talk from your personal experience only, if possible.
Writing for hire.
I make anywhere from $2-5K/month doing writing work. There is a strong demand for solid tech and financial writers, including ones who have startup experience. I have quite a few clients in the entrepreneurial space who frequently have me write about funding, business planning, and the other aspects of starting a business.
You can get some bylined work at Inc, Entrepreneur.com, and various stuff through the Writer's Market maybe talking about what you learned from your experience with a failed startup. People definitely read that kind of content.
My line's open if you want to learn how to get paid as a writer. Consulting's definitely a viable option, but if you money like RIGHT THE **** NOW, I can tell you how to do it in the wonderful world of writing for internet.