How do I create a object (zombie) spawner

How would I go about creating a way to spawn objects (zombies) just outside the layout at random places at a certain time?

Ps. I already have it set up so that once they are spawned outside the layout they change direction back to the player

~Cheers

almost every top-down shooter tutorial shows you some way.

You could use spawner objects around the screen and choose (randomize) where the next zombie should appear (every x second)

Or you could randomize the XY position (a bit more difficult)

Here is a nice tutorial about an Asteroids clone

here he starts placing spawner objects

https://youtu.be/wJ1h9HPhb4I?t=221

Cheers mate!