Just leave them as they are set from your last flight with your instructor. Later on down the road after you've soloed you can worry about getting a plane mechanically trimmed out to neutral, but for now just leave it. As an instructor I can tell you one of the things that is very aggravating is having to retrim a plane every weekend when the student tried to adjust something. I'm not trying to be mean to you at all here, but I really am trying to help. I've had this happen to me more than a few times where a student goes home and tries to adjust the plane, only to get back to the field on the next flying session and I find a plane that is way out of trim and almost impossible to control. If you are going to try and "adjust" anything you should always consult with you instructor first.

Ken