Just a reminder: You are first entering the basement, where you will encounter the rats Ren mentioned, and then you will need to find the trapdoor to the tunnels. I know all the trapdoors can get confusing. =)
Also, yes, it is a good idea to determine "marching order." As MAIA pointed out, the tunnels are narrow, only wide enough for one person. Plus, it will serve as a future reference if I ever decide to spring anything on you... >=D