Well assuming you are working from the airport, find out if you will have your own delivery area initially (for your 30(?) day qualifying) and try to get granular details about it. How are the delivery areas broken down; by city/town or zip code? Find out who the regular customers are, especially those with strict security procedures (for example I've had to make contact by intercom or phone, wait for door to unlock or open, pull inside building/loading dock/get all pkgs for delivery, sign in with security (even been photographed), trade my work ID badge for electronic key card, then make my way to delivery point (elevator to mail room) then reverse the process to get out), possible/probable traffic problems in the area (rail crossings/road construction/etc). Get phone numbers of other drivers. Pay attention to your local news for any events that might directly or indirectly affect your morning (such as trade shows or conventions).
There should be a supervisor with you for your first 2-3 days, but between the changes from our latest CEO and COVID, who knows? Or if s/he will be of any use?
Might be a good idea to learn where those other hubs are (addresses/directions) in case you end up having to shuttle their to them (if you do, make sure you find out where specifically you need to go on their property).
Are you going to be M-Fri, Tues-Sat, or Mon-Sat