Adlerdriver is right, there is no need to create a logbook if you never kept one before.

The Form 5 is the in your flight records as the sheet of data that summarizes each airframe you flew by crew position. At the top, it's titled "Flying History Report (PA)" then the next line says "Inquiry"

I did not take my printout of every sortie to my interviews (also 3 & hired at all 3), only the Form 5 & my spreadsheet of how I calculated PIC time IAW their mil conversion guidelines. There's several older but still valid threads on how to do that for any given airline.

For those still in or still early in their career, I highly recommend keeping a personal Excel or other electronic logbook of your mil time. Both as a backup to catch errors by the HARMS guys and to make the calculations and conversions easier down the road.