So, when/where do we start? I'm talking both plot-wise and real-life wise.

How many players are we waiting for? Where in-game are we going to start? Furthermore, I'm not [i]great[/i] with Japanese history, so I would appreciate it if anyone could give me a crash course on who should be enemies with who based on clan allegiances. I'm pretty sure that the Sanadas weren't friends with the Odas, but beyond that I'm not so sure about anyone else.