I will always give you all the information you need. Whenever there is no canon information and I ask the class for answers, I fully expect people to google or just make stuff up off the top of their heads. Some of the best lessons I ever taught were based off my students' imaginations. I tend to use the general known uses of things and then make the rest up. Also, many people don't realize this but, students don't know everything and I also enjoy playing with people who aren't know-it-alls (which is usually the entire class, which makes for very boring RP, in my opinion- what's the fun if you don't have an exploding cauldron every once in a while?).

With that said, it isn't realistic for each class to be a disaster either and many characters really are that smart.
As far as books go: I did have several posted back before I switched to charms for a few terms but, the potions master during that time deleted them. It has always been a goal of mine to finish those books and repost them. The books contained information from every class I'd ever taught (or that was the intention- I believe there were only 4 of the ten or so total terms I've taught included).