How do I create an object based on the global variable?

let's say the global variable was set to 0 a corresponding sprite is supposed to spawn.

You should have an action following it.

Like if time = 0, touch/click will create a sprite.

Unless you want it will be spawned continuously.

What if i have a global variable that has a random number set to it. number 0-3 and each number has a corresponding sprite or character that should spawn when the global variable is one of those numbers?

Of course, you can set the conditions

variable = 0 => Spawn sprite A

variable = 1 => Spawn sprite B

variable = 2 => Spawn sprite C

variable = 3 => Spawn sprite D