Dear Lixian,
Regarding 1), the 01, 02,etc. in the linearization output file names; these refer to the LinTimes you’ve set in the FAST primary input file (01 is LinTimes(1), 02 is LinTimes(2), etc.). If the rotor is stationary, you should only need to linearize once (NLinTimes = 1). If the rotor is spinning, I would normally recommend linearizing a number of times around a full azimuth rotation, e.g., NLinTimes = 36 with a linearization every 10-degrees of azimuth rotation (where LinTimes would depend on the rotor speed).
Regarding 2), there are several topics on this forum where the interpretation of the FAST linearization output is explained, e.g. see: Campbell Diagram & MBC3 output relation - #9 by Jason.Jonkman.
Best regards,