where is the file one has to edit?

What do you mean, "changing the barracks graphic " ?
If you're talking about the pedia icons, you should change the pedia entry in pediaicons.txt.
If you're talking about the little icons in the city interface, you can remplace them in building_large and _small.pcx but it's easier to add the new one and change the number in the pedia entry.
 
If you´re talking about the file for the buildings, well, it´s more or less easy.
  • The civpedia files are in
    Conquests\Art\Civilopedia\Icons\Buildings
  • The city screen icons are in
    Conquests\Art\city screen\buildings-large.pcx
    Conquests\Art\city screen\buildings-small.pcx
Note: in the buildings large/small pcx you have to make sure where the icon is (the cell number) so you can add it in the pediaicons.txt file.
 
What do you mean by "the map symbol" is that the tiny sword that appears when you have built a barracks?
 
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