Welcome to the guild, Sam!
I'm afraid I don't think there's any beginners guides.
Free is for no standards, no minimum or maximum.
Casual is some standards, generally a paragraph.
Advanced is many standards, generally walls of text.
Tabletop is for dice and stuff.
Arena is for fighting.
1X1 is just two people.
Nation is for controlling a nation.

And that's, I think, the Roleplay sections. If you have any questions feel free to ask.