Sounds like you just want a basic unit create trigger.
| Trigger |
| Conditions: |
| ¤ Always |
| Actions: |
¤ Create 1 Unit for Player at 'location'
|
¤ Wait for x milliseconds (1000ms = 1sec)
|
| ¤ Preserve Trigger |
The wait is optional, the unit will only spawn every two game seconds without it. The wait will add on to that time. If you want it to spawn faster, then, yes, you need hyper triggers.