Confused, intrigued & irritated

OK, so for a very long time, I am finally giving in but need help. I keep seeing story after story after story listed 'whatley academy' related. Honestly, I have never read it, I am having difficulty locating the 'original' version that started this 'universe'. I keep bypassing most stories i see labelled it, because I am without any idea to what is what about it. Would someone, please be ever so kind enough to lead me to this apparant 'best seller' of sorts?

Pretty please... with sugar on top <3

It is about time, I give in & give it a go, eh?