They will fly you out to Arizona for a week to intergrad, which is a week long ups driver school. Almost all drivers have to do that (I didn't). Then when you come back you have to go through a training packet on a training route. You have I think 40 days to manage to run scratch five days in a row.
Just work safely, smoothly, do not get into any accidents or get injured that's an automatic disqualification, always run straight air so if you do have a late air they can't DQ you for running ground with your air, and make sure you deliver all of your air savers before 3pm they can disqualify you for late air savers as well.
Welcome aboard bro! I worked local PD for a few years before starting my ups career in my early thirties. The work is hard, the

never ends, but the pay is good and the benefits are amazing.
Oh and do take steps to destress and to get your attitude realigned during the day. The stress when you're new is a killer.