This is a short instruction for creating a Play the World Game of the Month, especially for templar_x and Atishay Jain, who are creating upcoming GOTMs for summer. I write this from memory as I don't have an installation on this computer.
First you need to download
GOTM.zip and unzip the archive to extract GOTM.bix, which should be placed in the <installation directory>/PTW/Scenarios directory so that it is loadable from the PTW editor and the PTW game.
Once you load this initial scenario into the editor, the PTW editor that is, not the Conquests editor, immediately hit "Save As" and choose a new name such as GOTM_143.bix or GOTM_144.bix.
The first required change is to open the Scenario dialog and on the first tab in the Description text box change GOTM0XXX to GOTM0143 or GOTM0144, respectively. This is important for the Civ Fanatics scripts to recognize submitted saves.
Then for the second required change, move to the Players tab and set Player1 to the playable civilization, Rome or Iroquois in your case. Make sure that "Human player" is ticked. It probably is. Set the difficulty level of all players to Monarch or Deity, respectively, by selecting each one, one after the other, in the drop-down menu. If you add more players, repeat this step.
Remember to always save changes, e.g. by pressing Ctrl-S. A small star in the title of the editor main window indicates that some change is unsaved.
Use the proper menu item in the main window to bring up the map creation dialog. Here you can start being creative, but please keep a balance between map size and difficulty level so that the game can be finished in six weeks by most regular players. Standard map size is most often just fine. Other settings are up to you, having the difficulty level in mind. We don't want to play Iroquois on Deity without easy access to Horses. Create a map by hand or automatically.
Now to change starting location, as templar_x found out, deleting one is easier than placing one. In the properties dialog for a tile, select starting location for Player1, which should now be the playable civilization. A starting location will now appear with the proper colour and designated by name.
Please take a look at all starting locations for the AI and move them if needed, e.g. if they are on a food bonus, or move the food bonus. The AI always settles directly. In order to move a starting location, you have to delete the old one and create a new one. There is no function to move a starting location. You can pair starting locations to AI tribes or not, it is up to you. The game will do any remaining allocation when you first load the scenario.
In the Edit Rules dialog, you can make all kinds of changes to Civilizations, Units, Wonders, Improvements and so on. There is no need to change anything, but for a special twist to the game, rules can be tweaked. This is where you can change the name of the leaderhead as I did in the Babylon game, or put the names of your colleagues in the office or of drones in Star Wars as Great Leaders. Take care and remember to explain all relevant rule changes in the pre-game discussion thread or in a PM to me.
When you are happy and ready to test, save the scenario and open it
in the game under "Scenarios" instead of "Load game". In the dialog, all should be set alright. Here, you can select AI aggression level. Hit OK here and in the welcome dialog "You know roading and irrigation...". You have now created a starting save, so hit Save and make a screen capture for the starting location picture.
At this point, you can test the game by playing it, make changes in the editor to the scenario, create a new starting save with picture etc. until you are happy and ready to release the game.
The save from 4000 BC in the normal Saves directory is what you need to email to AlanH. He will put it in the database and it will be released automatically on the right date.
A pre-game discussion thread will serve as basis for the game release page. It should contain game details, descriptions of any rule changes, a picture of the starting location and if you wish a suitable illustration fitting to the civilization. The pre-game discussion thread should open three days before game release. You can create it yourself or ask me. Please keep to the given format. AlanH has to be informed so that he can make the thread sticky.