What does Rekindle reward?

Rekindle gives Flint and Tinder outright.

Where does Rekindle start?

It was picked up in Stonetalon Mountains.

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 Stonetalon Mountains and turned in to Firepit. Recorded by 4 players running the addon.

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

Item	Given	Item level	Vendor sell
Flint and Tinder	outright	5	33c

What does Rekindle reward?: Rekindle gives Flint and Tinder outright.
Where does Rekindle start?: It was picked up in Stonetalon Mountains.
What level is Rekindle?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Rekindle 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 · Stonetalon Mountains