Official comment
Hey Joe,
Congrats on the purchase!
You can download rekordbox now and start importing music to your library to analyse it and build the waveforms, then you can organize playlists, etc. You can also install the drivers before the mixer is connected.
You can peruse the DVS setup guide to know how to get things going once the mixer arrives.
And finally, when the DJM arrives, download and update the firmware following these instructions.