I'm new to modding, and i just started making maps. My problem is, when i finish the map and munge it, then open up bf2, it crashes. i have tried everything, and i was wondering if i counld send my ***_build file to someone and see if they have the same problem.

Show us your errorlog.
And give detail, what did you edit?

What Null means is put your BF2_Modtools shortcut into your gamedata folder and try to play your map.
It will crash and there will be an error log called BFront2.txt in that same folder. Open that and copy it and paste it into a new post