Adding new heroes to DOTA

[Golbez]

Hey all, I'm pretty new to the whole map editting scene, and I was looking for some help in adding in new heroes for DOTA maps.

So far, what I've tried doing is just opening an unprotected map (6.45 was the only one i could find) in World Edit and editting one of the heroes already in the map.

I noticed that there were no units/buildings when I opened the map, though this is normal, right?

Anyway, I made my changes to one of the heroes (Zeus) and went to save the map, but it stopped responding and crashed.

Would anyone be able to give me a brief run down of what I would need to do in order to add a new hero in, or atleast edit current ones?

Thanks for any help in advance.

[Xantan]

Edit it externally so the world editor doesnt freak, then I'd optimize and protect that unprotected map and see if it runs... if not your map doesn't work to begin with... which is actually normal for dota...