just hire. you will figure it out. a lot of people i know often wait for the 'perfect' candidate to show up at the door in a halo of divine light. aint gonna happen. most of the 'A-players' on my team currently were hired less on technical chops and more on un-measurables like 'sincerity', 'attitude'. these same people, now, with the benefit of decades of working together, would not hire themselves as they were when they joined.

in a nutshell: for a startup as early stage as yours, you need people. you will figure out what you need as you go along.