Need help inserting First view controller and 3d

Take and combine the necessary codes from the first person and third person camera scripts which are found among the Standard Asset package called "Character Controllers".

Set a boolean variable. Lets say:

 var isFirstPerson:boolean=true;

Then, what you want to do is to set conditionals for the lines of code you got from the first person and third person camera scripts. An example would be:

 function Update()
 {
     if(isFirstPerson)
     {
         //put the first person camera script here
     }
     else
     {
         //put the third person camera script here
     }
 }

Then you can put up some other conditionals to change the boolean value we created. An example would be:

inside the scope of function Update()

 if(Input.GetKeyDown(KeyCode.C))
 {
     isFirstPerson=!isFirstPerson //this "reverses" the value
 }

Hope I've been informative, have a nice day and good luck on your project.

Thank you very much!!