Didn't read the all 5 pages, but here's my input:
Go for it. Plenty of old heads are retiring and now is the time to get in. You'll probably have to go to PM shift; in our area that means being a swing driver, but you'll get all the hours you can handle. On PM, you'll have more a chance to get a full time (city/local) route quickly.
We have a RTD trainer (a seasoned RTD) that you ride and train with (pretrip, posttrip, shifting, backing, no street driving), before going to the 3 week class (sometimes out of state, FedEx pays).
After you come back from class, you have a little time before going to that the state test (depends on when you can get in). During this time,
you practice, practice, practice (you can't go on the road by yourself yet).
After passing the state, you may or may not drive with the RTD trainer. In the old days, they gave us a map, keys and said go. Nowadays,
the RTD trainer will ride with you a few days, then you're on your own.
My two cents: If you have a choice, try to get the hardest route. Upon mastering some of the worst stops, there will be no where you can't go.
Learn to drive the newer tractors, as well as the older ones. Drive single axles and twin screws (axles). Also, get yard mule and doubles training, if they offer it. We used to get 50 cents for doubles, but they took it back. Get the training in case you decide to go elsewhere ... it's FREE!
Good luck.