Ai Picking a Hero and will buy item

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Hey
I want to create a map myself for fun.
me and 2 ally versus 9 enemy there will be waves or spawn style one corridor


i want ai picked heros and buy items. Example we are 3 unded ai undeads pick first hero arthas and keep buy tome of knowlage if there is enough money.

my question
player 2 will pick a hero (i chosed before)
player 3 will pick a hero (i chosed before)

player 2 will buy tome of knowlage all game long (if undead items will buy from tomb of relics if human arcane vault etc.)
player 3 will buy tome of knowlage all game long (if undead items will buy from tomb of relics if human arcane vault etc.)

i dont know much about world editor share map will be more usefull then share code here then i can change values (i dont know how to copy paste codes here to my map)

thank you