IE, if your map is called NewMap, then the folder must be called NewMap too. If it is good, there must be 2, 3 or 4 files in your folder. tga file, which is the minimap or your map. Sometimes there is also a third file, called map.ini. In this file there are extra things, like changes in prerequisite, or the weather of the map. You can see this as ini changes from the TS or RA2 maps. This file is for the waves you may see in some maps.
To play your map, run your game, go to the skirmish menu, then go to the map selection menu and select the unofficial map list.
270 views Map Pack 3 for C&C Generals Zero Hour 22:09:00. If you have done it correctly, your map will be in that list. 561 view C&C Zero Hour Battlefields Map Pack 1.