Since this is your first temple, it would behoove you to do some preparation before you go in. The first and most important thing to do is to grab the Great Fairy’s Mask. The Great Fairy’s Mask, while decidedly creepy-looking, is an incredible boon that makes searching for the Stray Fairies scattered around each temple a much easier task. To get the Great Fairy’s Mask, you simply have to go talk to the Great Fairy of Magic in Clock Town after receiving the Deku Mask from the Happy Mask Salesman. Since time was reset, you will have to find the Stray Fairy in town again, but that won’t be too hard since you’ve done it already. The Great Fairy’s Mask will spring to life in dungeons if you are in a room with a Stray Fairy in it. For veterans of Majora’s Mask, the mask does not shimmer as brightly as it did in the N64 version, but just watch for the hair floating around rather than drooping when you stand still.
It would also be a wise move to grab the Adult’s Wallet before you leave, as it will keep you from wasting Rupees you may find in the temple. To get the Adult’s Wallet, store 200 Rupees at the Clock Town bank. There are several treasure chests in town that hold high amounts of Rupees as well as being able to farm the bushes for Rupees. You should have 200 in no time. The bank itself can be found behind the Clock Tower, along with a Save Point.