I’m thinking of making a rp help account. How do I make it a successful one?

I’m thinking of making a rp help account. How do I make it a successful one?
If not an admin what do you call someone who runs a rp help tumblr?
what do people think about a site starting small where everyone plots with each other and then eventually gets big thought people are still plotting with each other and it’s friendly, no one is ignored, different variety of characters and all that?
are there any specifically slash sites out there? i don’t mean sites that allow it, i mean an entirely slash site.
i’ve always wondered: for the roleplays set in korea, are you not allowed to make a non-asian character?
to the anon looking for an advanced rl site:
carry me home is an advanced real life site set in the fictional small town of avalon, conneticut. we’ve just gone through a ton of updates, and while this particular forum has only been open for two weeks, it’s a v2 of an older site, so we have quite a few dedicated members that won’t be leaving anytime soon! you should check us out. :3