It doesn't HAVE to be structured, especially if you run your own. I'm interested in modern fantasy (depending on your expectations), too, by the way. If you're interested, I can do a 1x1 with you that can demonstrate the standards of both Casual and Advanced, though you have no reason to feel intimidated in advanced. All that's required is 2-3 good paragraphs...or 3-4, depending who you ask. That's usually pretty easy to accomplish, especially when you're given some freedom to control the world around you. And if the trepidation is because it's a new site, then feel free to just jump in somewhere. Make your own RP, join one, whatever you feel most comfortable with.