Two remarks:

First, for non-technical founders, get technical yourself or at least get started: Get a computer, settle on Linux or Windows, get documentation, read, type in code, get it to work, and then build at least something simple.

Second, for technical people considering being a technical co-founder, here are is a threat you should watch for: Basically, the people in the start up, especially the non-technical people, may believe that it is in their interest to block your entering the company or, if you enter, throttle or block your contributions and push you out of the company.

Here those people may understand that what they are doing is bad for the company but believe that it is, still, good for them in the company. In the B-school subject organizational behavior, such behavior is called goal subordination because the person places the good of the company lower (subordinates it) to what they see as their own good.

In particular, a non-technical person, might work hard to hire a technical person with the intention that the technical person will fail so that, then, the non-technical person can have an excuse for not being more technical themselves.

Can such wacko things actually happen? Heck yes.