how do you make an item you can equip!

i would like to know how to make an item that you can equip to your player for example: Super Mario and mushrooms.

Please read the tutorials, especially this one: http://unity3d.com/support/resources/tutorials/fpstutorial

Part 2 should explain in detail what you need.

EDIT: more useful links: http://forum.unity3d.com/viewtopic.php?t=28433

http://answers.unity3d.com/questions/4897/how-can-i-start-learning-unity-fast-list-of-tutorials