of course would rather a religious one. Is there a difference ?
I end up dealing with young teens quite alot and can use some basics, not sure where to start
There certainly is a difference, but not necessarily in the content, more in the perspective from which it comes. Meaning, there are times that the two agree and talk about ideas in similar ways, but there are also times where they are drastically different. For example, there are forms of psychotherapy that are effective, yet are theoretically based in evolutionary psychology, with which mainstream Orthodox Jewish belief does not agree. Unlike medicine, which is a medical science and there are physical things that can tangibly observed, psychology is a social science, so philosophers and theorists who make up many of the foundations of psychology often do not hold, nor do they necessarily align with, religious values. Don't get me wrong, there certainly is utility in reading secular psychology texts as well, I do regularly. But it's important to know the difference. Hope this makes sense.
With regard to your question about working with teens, it might be helpful for yourself to clarify what it is you're trying to learn more about. Is it about how adolescents develop and think? Is it about addiction? Relationships? Their search for meaning and identity? Negative behaviors and rebelliousness?