I went on to the forums and I asked for input. And from the 6 responses I got, I was very pleased. I had some great insight on what to include from Misty Miller, who's blog, http://justathoughtortwotpt.blogspot.com is just a treasure trove of helpful hints for anyone that wants to improve their Teachers Pay Teachers store.
Over this long Labor Day weekend, I took her advice. I created the documents she suggested, and I included them on my TWO new products.
It will be a loooong time before I get a chance to edit EVERY SINGLE ONE of my 71 products to make sure they are up to date. But I will do at least one per weekend until Christmas Break, and then I'll reassess. (I also have to be sure to switch out my clipart ~which I think is all public domain and copyright free~ to be sure that I'm not infringing on anyone's intellectual property rights.)