I suggested in someone elses thread... looking for similar information... but now I can't find it... and I'm to lazy to look... hahahaha... so... I'll type it again
You need an idea for your story... scan through the titles here and look what others have come up with then build a story up before starting you RP (roleplay). It's freeform here, but it's my opinion that's for the players to interact... someone needs to guide the story.
Other ideas, look through the Wiki's and read the Lore of TES... there's a lot of stories that could be had from the lore, some events were tied to DLC and then left behind. You could take one of them and build on it, create a story and background and then tie to the present.
For my RP character, I used a DLC content and then expanded on it, creating a history for the character and the organization... I almost could make a short story out it.
Biggest thing, use your imagination... have fun with it...