[quote=Brovo]You have a fantasy RP? Try having the King of whatever nation write a letter to another, detailing the main conflict at hand for the party, add some exciting words, words that are vague enough to conjure any image but powerful enough to convey the validity of the problem at hand.[/quote]

This is a really neat idea :D! The interest check is pretty much the first bait so give them a feel of what you're RP is going to be like. You don't have to state everything off the bat though a summary of the plot and a short list of your expectations would be nice. That way, players know what they're getting into and know what you're expecting of them. Like Brovo said just keep up a friendly atmosphere and answer all the questions thrown at you. 

It's not really important, but a picture as a header makes things look prettier too.

As for the OOC. A few pictures here and there plus the basic information. Keeping huge chunks of texts hidden with hiders is nice since they might look threatening. Rules and Character sheets should probably be in the OOC as well. I find [url=http://www.weebly.com/]Weebly[/url] really useful for storing extra information though ^^