You should learn as much programming as you need to but if you find that it's not your strong suit then there are other options. Besides being the "business guy" in a startup, you can probably work on finding people who are passionate and fill in their holes. Chances are that someone is working on something similar enough to be useful to you. What you can do now is approach these people with one of your ideas, show them how you can reach mutual benefit and coordinate efforts so that you can get together all the people you need to make something great.