Here's a Primary lesson that teaches on this subject. The Lord Reveals the Law of Consecration.
I made this worksheet to go along with the lesson.
Here is an example of the worksheet filled in with some answers in case you want an example to look at.
Here's a game that we will play to introduce the lesson:
Play the game “I Don’t Need It—Would You Like It?” to help the children understand the concept of sharing their excess with others. Give each child a piece of paper and a pencil, and have the children list food, clothing, shelter, money, and books and games on their papers. The object of the game is for each child to obtain all the items on the list by either picking the items from the container or receiving them from another child.
Pass the container of papers to a child and have him or her choose a paper, read it, and put it back into the container. Have the child circle the named item on his or her paper. Then pass the container to the next child. When all the children have had a turn, begin again with the first child and have him or her pick another paper.
If on a subsequent turn a child picks an item that is already circled on his or her list, he or she turns to the child on the left and says, “I don’t need it—would you like it?” Then the child sitting to the left can circle that item on his or her list. If that child already has the item circled, he or she asks the question of the next child to the left. Continue until someone is able to circle the item.
Play the game until each child has circled every item on the list.
Here is a game sheet to help the kids log in their answers. My class is pretty young so I don't want to waste lesson time making them write these things down.
Here are the words that go in the container.
I'm also planning to show a General Conference video of President Monson talking in April 1991 (mentioned in the lesson). It is from the talk called "A Royal Priesthood" and the story I am using is at 16:00 minutes.
Here are the words in the story but I will show the video on an iPad. Words and video on on THIS LINK.