Don't. You are much better off hiring people than having a cofounder. Because it's great when things are going well. But when they aren't you aren't going to be

Don't. You are much better off hiring people than having a cofounder. Because it's great when things are going well. But when they aren't you aren't going to be motivated AT ALL to work on YOUR idea. Cofounders work better when you both come up with the idea at the same time.