MASKS
here are the masks that you sell in order throughout the game...
Kenton Mask
This is your first mask, if you have met the guard at Kakoriko Village yet, he'll want you to get him this mask. He pays you 15 rupees for a 10 rupee mask so you get a discount. Take the money back to the shop and borrow the next mask.
Skull Mask
This is your second mask. Take this to Lost Woods and talk to Skull Kid while wearing this mask. Remember, you better learn Saria's Song before talking to him. He'll pay you 10 rupees for a 15 rupees mask. you lose 5 rupees from your own money. Take the money back and get the next mask.
Spooky Mask 
This is your third mask. Take this to the Graveyard in Kakoriko Village during the day and sell it to the little kid. He'll pay you full price for it. Take the money back and get the next mask.
Bunny hood 
This is your fourth mask. Take this to Hyrule Field. Go in counter clockwise around Lon Lon Ranch. you should be able to spot the running man. When he stops to take a break, put on the mask and talk to him. He'll want to buy it for more than full price. I think you should get the Giant's Wallet because he'll pay you more than you can carry. take the money back to get your final mask.
Mask of Truth 
This is your last mask. This is given a reward to you for selling all of the mask. Wearing this mask and talking to a gossip stone will get you tips throughout the game. This mask has the power to read minds.
Goron, Zora, and Gerudo Masks 
These masks will be available at the Happy Mask Shop as a reward for selling all of the mask. You can't really sell them but you get interesting reactions from people.