unit spawning, mass trigger.

Ok, im going to try and do this part of the triggering by myself but i need some help

I made a region called *redspawn1*

On triggers i made a category called "red spawning"
So my question is, how do i set player red(player 1) to start spawning x units every x seconds??? can someone tell me how i would set it up?

Note: ive tried setting it up but i cant find how i would start it.

if someone can tell me how i would start this i would be very greatful... and it would make things way easier....

Also after that, how would i change it so when player 1 has x kills it starts spawning x units(different) every x seconds? like changes so it doesn't add on to the previous trigger?

Once i know this, then i can do most of the spawning triggers....

Also I have another question adding onto this. how would i make it so when player 1 reaches x kills player 1 gets a specific hero, then continues on spawning the other units without spawning the hero again??

I tried being as simple as possible... Ill ask about the mass buttons later once i get a hang of the spawning triggers...

can someone please tell me? and possibly put it in quotes? and explain which section of w/e it would be in? specific as possible is appreciated.

(ill give rep for pple who can help me with this!)


EDIT: oh i forgot to add, how do i make it so player 2(blue AI for testing) will send a group a forces at me every 20 seconds, and attacks me???)

There is a periodic event. And there are actions to create a number of units and send them to some point.