>Be conservative with your equity. One of the easiest ways to scare off a technical co-founder is to offer 50% of your company in an initial email or meeting. Freelancers in particular take this as a sign of your trying to get free labor. 50% of nothing is still nothing.

I completely disagree with this. You want to find a co-founder, not an employee. In the early stage your technical co-founder will be doing 90% of the actually work. To offer them a small equity stake because it's your idea is an absolute joke.