tank controller

Use google. Do tutorials, and learn how to use Unity.

Sorry, but your question is too broad, and this is not the place to ask for scripts. Unity Answers and its community is here to help you solve any Unity specific problems you have, not give away free code. If you don't know how to write code, I suggest learning Unity's Java Script (its really easy), but if you don't have time, or whatever, then you can try asking your question on the Unity Forums (http://forum.unity3d.com/). I hope you can get an answer!

Here is a list of tutorials to get you going :

Start at the bottom and work up : http://www.unity3dstudent.com/category/modules/

the Unity Wiki : http://wiki.unity3d.com/index.php/Tutorials

A list of resources : http://answers.unity3d.com/questions/12321/how-can-i-start-learning-unity-fast-list-of-tutori.html

Tray This https://youtu.be/GLo7vzXXdbY