have a working inventory in Unity 3d

I would like the inventory done by Sunday and I would like the inventory done in the living room scene. I would like to add the following items to the inventory: towel, a knight from the chess scene, a key , a pawn from the chess scene to be placed in the inventory. In addition, to be able to move the pawn and knight and king to the chess scene in the correct position and the towel to be placed on a mirror to remove a particle system and the key to be placed on the door, to end the level.