My first Hero costs gold, but I don't want that!

I'm making a custom map and you start out by (voila!) picking a hero. Now I want that hero not to cost gold, and I want a second or third hero to cost gold like regular. (just like in melee) Now I know that it has something to do with leaving the melee initialization trigger intact and I even had it working at some point but now that I've changed my map (don't remember what cause I'm changing it a lot) the whole damn first hero costs gold again.
Could anyone please tell me the exact requirements for NO gold cost?
Well thank you! ; )

There's a trigger, under "Player", that says "Set property". With this you can change a bunch of stuff, one of them being "add Free hero for player". That's what you're looking for. Set the value to 1, or anything else u want.