Hello, I am a big beginner with scripting things. I need some help!
I wanne make a Script that if you don’t move it runs animtion “idle”.
If you walk it runs animtion “walk”.
And if you walk it runs animtion “run”
Can someone help me please?? Really thanks if you can help me. 
Start here http://unity3d.com/support/documentation/Manual/Character-Animation.html
When you have read half of the page, you will find your graal. Please do not jump right on to the scripting part as you would not learn anything then…
When you have a question, save yourself some time and google the question first. You are likely to get quick and efficient help.