You just just took the first step to being a successful entrepreneur. Good job! :D
That's a great check-list of stuff you need to know. Part of the journey being an entrepreneur is getting out there and meeting people in the greater business world beyond your industry.
I would recommend starting low and building up. Plan to get into a place like Bootup Labs, Workspace, or The Network Hub, and leverage their services. It's a great way to get in close proximity with people who've got that all important understanding on tap. Bonus that your services marketed around, all because people got familiar with what you do.
Plan to make little money on your leader projects. It's not automatic that you can charge a lot of money from the get-go, so you have to provide the prospective client incentive to take that risk with a talented start-up. Make sure you've got a portfolio on tap, but don't waste too much time up front. There's just too much great stuff you can be doing with your time than prep-prep-prep. It's a balance of reaching out (extrovert), and knuckling down and pushing yourself to get stuff done (introvert).
Here's my VCard, if you've got any questions, feel free to call.