Typically, I work M-F 10a - 6p PST. I'm from California and live in Santa Barbara.
Depending on the size of the project, billing can be A) flat rate or B) hourly. A hybrid of the two is also possible.
Before accepting a project, I'd like to have a phone call, Skype, of GoToMeeting to discuss it's complexities.
During the project, email is often the best communication vehicle for non-time sensitive or bullet-pointing concepts. Phone calls are also welcome!