Look for ex-CTOs of startups in your space / field skilled in technology stack of your choosing. They have the skill, experience and vision to architect your (product development) strategy which you should factor in into your businessplan. Learn on other peoples mistakes paid for by other peoples money 
Look where? Linkedin, developer and startup meetups, twitter, blogs. Once you find one you’re facing a challange of convincing them to drop everything and work with you. And they are picky…
Our CTO-as-a-service offering might be of interest to you.