I wanna start reading this, but where do I even start? I don’t see the chapters in order...

I wanna start reading this, but where do I even start? I don’t see the chapters in order. What is the official site it’s on? How are yall reading it on here?!? There’s not even a chapter one! I don’t wanna get ahead so I didn’t read chapter 0 or 3….why did the officials start at 5??? lol I just wanna read this