Campaign story brainstorm

Im sorry, posted in the wrong forum, can a mod move this to general development?

I've began working on this campaign, but doesnt really have a clear idea about the storyline yet. I would like to share some ideas with you, and hope you guys could give me some ideas on how to work further with it.

The concept is that there are three powers. The most powerful is an tyrannic regime called Seljer (human), in which the players characther Thale begin to do quest for. As she gain level, she moves over to elf land(Alver). (with smooth transition, meaning there live elves in human land, but their a minority, and there live human in elf land, but their also an minority among the elves.) So you kinda do quests for both factions at the same time. These two powers are neutral/allied to each other. The twist is when we introduce the third power, which is a rebellion (aka star wars). Thale gets involved with them, and need to bring the elves over on the rebellion side. But I need filler. Why do Thale travel the world, what is so tyrannical about the Seljer, how is the Elves persuaded to join the Rebellion and so on. I want to use you as a source of creativity, so if you have any ideas on this, bring them on.

The drawed map shows the lands (each land is one warcraft map), the lands marked with red around them is Seljer(tyran humans, purple and green lands), the blue is Alver (carefree elves, pink and orange lands) and the yellow is scarcely populated areas which serves as a refuge for the Rebellion (yellow and orange lands). The town is Storm, capital of Seljer and first mission (and maybe last )

Edit: At the questing part, im thinking more of wow-style questing progress, at least in the beginning, where there are many quests but their all kinda small, not that epic. Rewards goes from getting gold, experience or maybe even a new spell. I've also thinking of being able to buy new ranks of the spells. But most quest are required in order to get progress, so it wont be exactly like wow.