Build out your interview process.
Figure out how many interviews you are going to do, what questions you are going to ask, those sorts of things.
And be smart with these. You can't just ask somebody if they represent your core values. The answer is always going to be yes.
Instead get creative with asking questions that get them to tell you a story about a time in their life when they may or may not have had that core value. Your job is then to listen closely and determine whether or not that core value exists in them.