Hiyaaaa and welcome! 8D It's great to have you here! <3
As for OOC indication, what Crono said. As long as you can tell the difference between OOC and IC, it's all good! Some people use ((double parenthesis)), I sometimes use [brackets], sometimes I separate with a line depending on my mood...it's your choice! We're not fussy. ^^
Anyway! Hope you have a blast here and if you ever wanna RP, I have lotsa characters! <3