Major help with map

[IllidanDH]

I started creating a custom made map about 3-4 days ago and ive run in to problems. First I don't know how to create a hero selection trigger such as one in DOTA and the ability to make multiple heros. Second I would like to make it so the computer will attack the towns "and sussfuly." The last thing i need help with is unlimited resourses. Examples of these are in the LoAP series with druggy's trees but i do not know how to do this with a gold mine and trees. Please help if you can. Thanks.

IllidanDH

Edits: Ok ive figured out the hero trigger, and unlimited resourses. But I need help with AI and a trigger that puts everyone at nuteral with everyone until a trigger is activated.