My advice would be to learn lighting. Lighting is really what makes a great picture. Learn to adjust your own aperture and shutter speed. These will go hand in hand with lighting and depth of field. I also highly recommend focusing the lens yourself, rather than having it on auto. These can make the difference between a photographer, and just someone with a camera.
If you, or anyone else, has any questions, you can pm me, or email me at firstname.lastname@example.org
I used to work with some really amazing photographers and learned a lot. Im willing to pass that on.