When I was getting started, I would often obsess over the "right" formats for different types of communication with clients. Ultimately, I decided what clients

When I was getting started, I would often obsess over the "right" formats for different types of communication with clients. Ultimately, I decided what clients really want is to know you are doing everything reasonably possible to take care of them, being courteous, keeping them informed, yet not drowning them in detail. So, the simplest format that covers these points is a good start. You can then ask for feedback.