Aos map triggers

well im working on an aos type map. im sure most of u are familiar with those types of maps , like dota, tob. anyway. i think everyone can notice that the buildings produce units themselves and the computer automatically sends the units in a certain path. i was wondering how is it that u trigger this so that a building makes units and sends them to a certain point. and also , how can i control the number of units it spawns. and one more thing. how do can i make just random units pop out like in dota when a hydra just spawns out of nowwhere, anyway ty for taking the time to help and ty in advance ^_^

To answer one of your questions:

to make a building make a unit, use the following trigger:

Unit - Order (Last created unit) to train/upgrade to a Footman

And to order it along a certain path just make it so that when the footman comes out you give it an order to go... wherever it's supposed to go. Probably want to make it attack-move, since you want it to attack things in its path. To make things pop out of "nowhere", just do something like this:

Unit - create 1 (some unit) at random point in (a region where you want the units to appear) facing default unit facing degrees

Anyway, if you need help with this, just ask.

Another way to do this stuff is just to create units with unit-create unit action, and have the buildings there just for show. You can see some simple AoS pathing triggers in my map (link in signature); just look under red/blue spawning... Of course, it may not be the best system out there, but it worked for me.