Arrow random range firing 2D only Unity 5

This Photo will help better described what i was looking for...to have this black tower to launch with arch all 5 arrows with 2 second pause between each arrow fired and instantiate firing between the random range of 0-60 seconds, my arrow is a prefab rigidbody with no script attached to it yet, the tower is stationary and the red dot can only move left or right on limited screen. The arrows will lock unto target but the time it arch's and lands it will give the player or red dot plenty of time to move depending on my velocity. I am using unity 5 C sharp.

Thank you for any help i know this must be a simple thing but the nice arch of arrow and firing randomly on its own, seems to allude me. I cant expect anyone to hold my hand on this but its been a long 3 days and im lost ...lol