Configuration is most useful when every field has an owner and a purpose. Collecting a value because it existed in an old spreadsheet is not enough.
Step 01
Start with a decision
For each proposed field, identify who supplies it, who uses it and what action or report depends on it.
Step 02
Choose the owning record
Put the value on the person, position, organization, agreement or case that is responsible for maintaining it.
Step 03
Test boundary examples
Try ordinary, unusual and incomplete records before making a field required or publishing it to a wider audience.