[flukus]

You don't need a co-founder, you need a senior developer/engineer. If you don't have the technical nous yourself then finding a good one is way too much of a crap shoot, so you don't want to hand over a chunk of the company.

Consider also that from a technical point of view, you prbably don't and will never need a big investment in technology anyway. Build as little custom software as you can because it's expensive to build and even more expensive to maintain (there is no such thing as a "done" phase). Have someone on payroll that can learn the business and it's users and customers that can gradually iterate.