Most of your questions were answered. It comes with a drive spur, most are four wing and this is what “drives” the wood when held between the headstock and tailstock.
The faceplate also drives the wood but allows you to not have the tailstock in place. However, due to the screws it does take away from the usable wood (normally not a problem) and it is used with larger diameter items. The manual shows how to use both the drive spur and the faceplate.
To add to what John said, think of the spindle as a drive shaft. It drives a spur, faceplate, chuck, or other method of driving the wood. It appears it to have the 1” spindle from the manual. It is possible specs were changed on that model and all data not upgraded.
A chuck is not necessary but very nice. Nova introduced the first woodworking scroll chuck in 1988 so for many hundreds of years only drive spurs, faceplates, etc were used.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin