Need help with spawning enemies! (2D Platformer)

So, I have the enemy (here referred to as arenaEnemy1), and I have the spawn point (here referred to as arenaSpawnbox). I have been completely unsuccessful in all previous attempts, but here's the basics of what I want to happen:

I want an enemy to spawn at the spawn point every 1000 milliseconds and follow proper enemy behavior (that is, go directly towards the player in a horizontal straight line).

Problems I have had with this include: Enemies never spawning, enemies not following the behavior I have given them, one enemy spawning and then no more, the list goes on for a while. Can anyone help me?

You should post a cap so that someone can find the problem. Dropbox is best, though I've seen people use Mediafire without complaints.

Apart from what TL22 said, you need to include examples at minimum of event structures that you have already tried.

Example:

+Every 1000 milliseconds

->Create enemysprite at X,Y

->Do Stuff, etc

The more information we have, the easier and more effectively we can help you.

~Sol