Hello there, welcome! Well, first things first, this must be in the Writer's Longue;
That sorta says everything. Well, this means the mod (Astinus) may be moving this to the Writer's Longue any time soon.
And as for 'yer advice, well, starting to post the Fic is a way to start. Just create a new thread in the main forum and put at least one chapter. That, once you're done with grammar and stuff. And don't worry, the users will review it and tell you how to make it better (or if it's already awesome, just gonna say how cool it is), the don't bite (hard) so don't be afraid.
Hope this helped you out. And by the way, if you ever feel like needing advice, then you can contact the mod. either by a Private Message or a Visitor Message.
I'm really hoping this advice helped. I'm looking forwards to see your Fic.