This document provides a high-level description of the game rules as implemented by PHost. It contains links to the more detailed descriptions. If you are new to the game, you should read this.
Inevitable technical warning ahead: The things you can do also depend on the client program you use. Some will let you define multi-hop waypoints in advance. Some will automatically choose the right taxes or randomize friendly codes. Some include a report generator or a printable map.... All client programs should allow you to give all orders described here, although the presentation will differ.