Hi Max,
yes, there are!
I could teach you here if I had a few months of time...but since I don´t, I would suggest you do some google searching for keywords like "FCOM" "737-300", and so on.
I think there are even some links flying around in this forum...shouldn´t be hard to find for an internet-savvy person, but of course reading "official" documentation isn´t really entertaining.
Jan