Basically, if you want to avoid spoilers the order is to read the riftwar saga and empire trilogy before playing the game.
Pretty hefty read for one month, especially if you also want to play the game. From what I recall, it should be fairly okey to leave the excellent empire trilogy until after the game (it’s co-authored by Wurts). Maybe that would even be better, since it would leave the empire being somwhat more unfamiliar, as most player characters would view it.
Feist’s Bibliography: https://en.wikipedia.org/wiki/Raymond_E._Feist_bibliography
