Okay this is easy, so this should progress quickly. ^^
<Main
 Name="First Map"   <--- Name of the custom story
 Author="Mapping by Seth, Scripting by JetlinerX" <--- This is fine, but you can shorten it to just Seth & JetlinerX for now, then specify what you two did in the credits
 ImgFile="" <-- If you're not including an image, this can go
 
MapsFolder = "maps" <-- Location of your StartMap, should be "maps/"
 StartMap="test.map" <--- Name of the first map the player starts on
 StartPos="PlayerStartArea_1" <--- Name of the starting area
 /> 
So, it should be like this:
<Main
        Name = "First Map"
        Author = "Seth and JetlinerX"
        
        MapsFolder = "maps/"
        StartMap = "test.map"
        StartPos = "PlayerStartArea_1"
/>
The story's actual description goes in your extra_english.lang folder.
Add this to the file:
<LANGUAGE>
[TAB here]<CATEGORY Name="CustomStoryMain">
[TAB here, add 2 spaces]<Entry Name="Description">Your story's description here</Entry>
[TAB here]</CATEGORY>
</LANGUAGE>
Remember if you want to put an enter space in the description, for example you wanted it to say:
"This is my custom story.
It's so awesome."
You have to add [br][br] to your description. Like this: 
<LANGUAGE>
[TAB here]<CATEGORY Name="CustomStoryMain">
[TAB here, add 2 spaces]<Entry Name="Description">This is my custom story.[br][br]It's so awesome.</Entry>
[TAB here]</CATEGORY>
</LANGUAGE>
And there you go! 

[TAB here]/[TAB here, add 2 spaces]* sorry about that, it wouldn't let me add spaces or TAB. >:c
			
 
			
			
Ba-da bing, ba-da boom.