Randomly Flash Buttons

i want to make one simple game.
it is very easy.
there are 2 button left and right bottom
randomly one of this two buttons apear if you press on time you earn 1 points if you cant press you lost -2 point.
if you press wrong button you lost -2 points too.
how can i make this

 

Code (CSharp):

1. public gameObject myButton1;
2. public gameObject myButton2;
3. private bool processButton1 = true;
4. private bool processButton2 = true;
5.  
6. void Awake(){
7.   myButton1.setActive(false); //INITIALIZE HIDDEN
8.   myButton2.setActive(false);
9. }
10.  
11. void Update(){
12.   if(processButton1){ //IF WE SHOULD BE CHECKING
13.     if(Random.value < 0.5f){ //PICK A RANDOM NUMBER BETWEEN 0.0f to 1.0f
14.       processButton1 = false; //STOP CHECKING
15.       myButton1.setActive(true); //SHOW THE BUTTON
16.       StartCoroutine(DelayHideButton1()); //AFTER A WHILE HIDE THE BUTTON
17.     }
18.   }
19.   if(processButton2){
20.     if(Random.value > 0.5f){
21.       processButton2 = false;
22.       myButton2.setActive(true);
23.       StartCoroutine(DelayHideButton2());
24.     }
25.   }
26. }
27.  
28. IEnumerator DelayHideButton1() {
29.   yield return new WaitForSeconds(0.5f); //WAIT HALF A SECOND
30.   myButton1.setActive(false); //HIDE THE BUTTON
31.   processButton1 = true; //AGAIN RUN Update() TO SEE IF WE SHOULD SHOW IT AGAIN
32. }
33.  
34. IEnumerator DelayHideButton2() {
35.   yield return new WaitForSeconds(0.5f);
36.   myButton2.setActive(false);
37.   processButton2 = true;
38. }

 

ty mate.
i try it.
i am very new of coding. actualy i am very old to learn (30 years old). but i want something and i realize i have start somewhere.
i am very good at make terrain but very bad at coding.
ty reply my message