How to change the max_health of a turret with many kills, for example?

i just want to spawn some enemies around me or somewhere, at begin of a game, just to see how it works. What do i have to do?

spawn_enemy(name, surf, pos)

ok, that sounds good, but how can i set the "pos", and what want that "surf"?

I just used "place_result = unit[name]" in the "type = item". Yes, easy. Too easy.
And the "force = enemy" placed in the "type = unit", does nothing.
So, think you re right, i have to use more lua code. But i hoped for a more easy way.

i want to place Units in game, like Biters. Wrote a mod for this, but they are friendly. Want them to be enemies. But how? Cant get it.