Well, first things first, this version of freddy is from a seperate time line than the one you are playing in. This freddy is not from the original time line of fnafb, more about this freddy will be revealed throughout the game.

There will be set locations that you have to go to in order, after completing an area you can travel back to said area for items

Certain weapons will only be in certain areas, for example, if the weapon is a “flaming fire death sword” it will only be found in the flaming caves, some side quest items will be found in certain areas too