Don't take this the wrong way at all, but I would highly recommend "Desing of Wood Structures - ASD" by Donald E. Breyer. It deals with everything you'll need to know to design your four story wood building.
As a side note, under IBC 2003, section 2308.2 (Conventional light-frame construction Limitations):
2308.2.
-1. Buildings shall be limited to a maximum of three stories above grade.