I'll try to answer your questions in the order in which they were asked:
Follow print; so only put the alphabetic numbers that actually appear in print.
Yes, what you did is correct...the student will follow based on context and the hyphens are fine.
A TN is not required, but if you feel it would help the student, include one.
No. I would put i-v.
If I missed something, let me know! 🙂