You can get away without learning any language if you have a technical co-founder who you trust and can play the CTO role.

However its always good to have a bit of technical edge so that you can express your ideas in a more profound way to the technical team and also can sync yourself with the development challenges.

In case of learning a language completely, I believe you should concentrate on the logics of programming first.

You should start with simply breaking down all functionalities of your system in flow diagrams and trying to understand how everything works.

If you are adamant about getting your hands dirty with a language, my advice would be to go for a easy scripting language. (PHP for instance). If you use Microsoft Excel, you may learn Excel VBA which is a simplified version of visual basic inside excel that lets do a lot of fun stuff with your excel data.

And if you don't mind spending some bucks, there is a good course called programming for non programmers in udemy. Google it.