Not sure if you did a search on FD but there are probably ten questions/discussion like this already http://members.founderdating.com/discuss/topic/Cofounder is a good place to start - or just the search bar. I'd read there and the founders thoughts on questions to ask cofounders here
I don't see why you'd want a finance background
Finally, congrats on getting things launched but at the end of the day if you lead just with your company it's a hard sell and you're looking for an employee not a cofounder. Talk to them about you, the story and why they are potentially interesting. I'd also apply to join the cofounder network on FD - doing that seems like the lowest hanging fruit possible.