We have a planning forum for this sorta thing:
http://www.gaiaonline.com/guilds/viewforum.php?f=1460037But I suggest creating something based on what you know. Whatever you read a lot, watch a lot, or play a lot
3nodding That's one of the best ways to ensure you will be able to establish and rp world and story that sounds consistent and realistic due to your already extensive knowledge on the topic.
If you have an interest in something new, then I encourage you to read up, do some wiki, and try that.
3nodding 
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