If you haven't googled it yet - I will tell you this ,,system'' in few sentences.
Firstible, in roleplay game you choose your character, you can be anyone you want, fictional character or the real one. You can do anything with your character - make it gay, or make it die. It's your own choose.
But how to roleplay? In this forum, we will be writing it in sentences way.
Example: *Ruki opens the door and stands back surprised. His old school friend is standing right in front of him*
It means you get into your characters role, and you are responsible for it's own actions.
Also, you don't need to write your roleplay posts into those star things (*). You also can use brackets([, {, ( ), hyphens(-). It's up to you.
So, if you still have any questions, please ask here. I will answer it as soon as I can. Good roleplaying!