What does Rare Books reward?

Rare Books gives a choice of Apprentice's Spellstaff, Militia Shortblade, Militia Sword, Northshire Hammer, Militia Bow, 3s 50c, 800 experience.

Where does Rare Books start?

It was picked up in Elwynn Forest.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

World of Warcraft: Forever · quest · new since Classic Era

A quest in World of Warcraft: Forever in Elwynn Forest and turned in to Brother Paxton. Recorded by 1 player running the addon.

Level, giver and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Apprentice's Spellstaff	as a choice	12	6s 1c
Militia Shortblade	as a choice	12	4s 68c
Militia Sword	as a choice	12	3s 26c
Northshire Hammer	as a choice	12	4s 66c
Militia Bow	as a choice	14	2s 64c

What does Rare Books reward?: Rare Books gives a choice of Apprentice's Spellstaff, Militia Shortblade, Militia Sword, Northshire Hammer, Militia Bow, 3s 50c, 800 experience.
Where does Rare Books start?: It was picked up in Elwynn Forest.
What level is Rare Books?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Rare Books new in WoW Forever?: Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Elwynn Forest