Dear Charlie,
The CampbellDiagram.xls workbook sorts the eigenvalues and eigenvectors by frequency and highlights the dominant components of each mode to aid in interpretation of the modes. This has been discussed several times on this forum e.g. see: Campbell Diagram & MBC3 output relation - #2 by Jason.Jonkman.
I’m not sure I understand your second question, but you only need to enable the ElastoDyn module if all you want to do is calculate the wind turbine natural frequencies in standstill without aerodynamics.
Best regards,