Need some help with wiring (House)

I am not an electrician, and will not try to recommend a wiring diagram.
What I will recommend, though, is putting a timer switch on the fan. I remodeled our master bath last year and installed two, for two separate fans. I consider it one of the best upgrades I done! Put it on 30 minutes, take a shower and not have to go back or remember to go back to shut the fan off. I really like it.
C