First of all you will have to open the program.
When you install Company of Heroes (CoH) there wont be an icon for the Worldbuilder…. The worldbuilder.exe file are located in the CoH main folder, go create a shortcut for it.
Now when you can easily find your program, launch it and lets make your first map.

The  first thing you do is to click the "new" button in the top bar.
When you do that a little window opens, where you can select the size of your new map.
Since this is your first map, it is important that you dont make it too big, so lets just go with the preselected size.
Make sure the "mod" is set to "Invasion of Normandy".

Then Click the "OK" button, now you will have to wait a moment while your computer creates the map base.

Your first map is just a flat surface with nothing on it.

To be able to see the borders of the playable area; open the overlay meny and mark the "toggle show playable area".

To be able to play a map you will have to place at least 2 players on the map.
Each player needs a HQ building and a map entry point (for of map reinforcements).
These are objects, so go and open the objects menu.

Objects menu

It will take a moment for the computer to load objects library, please be patient.

Now to add some territory to the HQ´s,.
Open the territories menu.

But…….
To use the map you will have to give it a name and save it.

And now for the final touch.
The map you have saved is still in the devlopers format (SGB), to distribute the map to the community or your friends you will have to compress it to an SGA file, to do that open the "File" menu, and select "export package".
This executes the packing program and creates an SGA file in "Documents/my games/company of heroes/scenarios".