Here is an outline of a basic Rp.
Title- it should be catchy and tell a few things about it. Like is it a WOF or a Harry Potter Rp. Does it have Limited or Unlimited spots? I would also recommend keeping the title short and easy/fast to read. People will more likely read something if it has a short interesting title. (This may or may not work 100% of the time)
Introduction- Basically tells the players what the direction of the Rp is. It also tells the plot or basis of the world or story.
(Another Tip it's a good idea to separate things into different paragraphs. )
Rules: It's a good idea to have a few rules around to keep things from spiraling out of control. An example of this is No fighting or no colored hair.
That's all I have for now but I'll add more latter.