Enemy spawning at an area

[SLAMnesia]

Im sure there have been threads similar to this one before, but I've searched with no avail. so heres my problem, its simple and do able i just dont know how:

How do I make an enemy (water lurker) spawn/activate when I enter an area? I also want the player to look at the enemy but not lock the screen on the lurker cuz you'll need to turn and run.
i made the area and lurker heres the names
Area:lurkerspawn
lurker:rawr

any help is 200% appreciated thanks, as you can probably tell im relatively new to this stuff
<3