+1 with Lowell. He gave you excellent advice.
I would add simply:
- get a good-quality SD card; you do not want to loose your shots because the card fails;
- get a hood; outdoor, the hood is a must to reduce the risk of flare;
- get a compact carry bag, from where you can get quickly your camera;
- read the instruction manual; if your instructor is willing to assist with a Pentax, you will enjoy the K-7... but remember that a dSLR is not a P&S; it is worth to read the instructions to get the most out of the camera;
- lastly, enjoy....
Hope that the few comments will help...