Sharing ints,Camera position(MOba),warnings,Could loop a fuction in start???

So yesterday i made a question but only one guy aswer it and it wasnt quite a Answer more a advice but ive got this tree to four problem here are they in topics (Solve them in topics too) plz

I cant share ints...

So the code is in this site pastebin http://pastebin.com/35jGMRXA and in this page http://pastebin.com/639V3sec Its public so anione can check it any time... So in the code i tried to share the int like this if(GameObject.Find("edificio").GetComponent().atacado == true){ setX = GameObject.Find ("edificio").GetComponent<vidaEdificioScratch> ().goX; setY = GameObject.Find ("edificio").GetComponent<vidaEdificioScratch> ().goY; setZ = GameObject.Find ("edificio").GetComponent<vidaEdificioScratch> ().goZ; } but it didnt work and a wild error as appeared (XD) so it said me this Object reference not set to an instance of an Object

I looped in the start method

my dad is an a medium programer but is always busy and it dont mess around with code like 20 years... but he telled me the start method only takes 0 frames so i think well no loops But yesterday i put in the start method intantiate(game object); and AND IT CRASHED MY PC with so many objects created...

Help in thinking???

yeah im not english but i want to make a moba camera but without depending on a character (Terrain Camera???) so i coded this

 public float setX;
 public float setY; 
 public float setZ; 
 //here is void start etc...
     void Update () {
         setX = Input.mousePosition.x;
         setZ = Input.mousePosition.y;
         transform.position = new Vector3 (setX, setZ, setY);

and it dindt work because i supoused the window is 1000 x500 because the floats go only to that position...

Dindt clarify enought tipe in the comments or in the aswer...