Perhaps the first thing you should do is post in the correct subforum; see the rules at the top of the page (
http://forum.paradoxplaza.com/forum/showthread.php?t=81289).
The other thing you might want to do is look in the scenario list, stickied at the top of the main Scenarios forum; there you will find that there is already a WW1 scenario.
However, this won't be any use to you, since it will start a new scenario in 1914. What you really want is to extend your current game, which can be easily accomplished by opening the save file in notepad and changing the enddates of the scenario. Have a look around, can't remember exactly where the numbers are you need to change.
