Being a good instructor has a lot to do with attitude, rather than flying experience. Obviously you need to be able to handle an aircraft, but you don't need to be Biggles!
Bear in mind that there is a lot more to teaching a PPL than teaching them the physical flying skills. I personally think that airmanship is more important, and giving your students the ability to make sensible decisions.
Leading by example is important. eg. there's no point teaching your student to fly perfect steep turns if you then set a bad example by encouraging your students to fly in marginal weather.
TB