I think you wont get happy on warmode here. Aside from those that have it on for leveling there arent many here and especially for rp its deactivated.
The Addons to use are TRP3 and (at least i would recomend it) Listener. Trp is the one you talked about, where you can see the backstory, First glances etc.
Listener is something that gives you aditional chat screens. It also warns you whenever someone says your name or emotes directly at you and you can just hover over a player and you have a chat window with just the things they said, so really usefull.
There are others but thats more for guild stuff and you would read there if you would ever join one.
For a backstory and a concept there is a great guide (together with some other usefull guides) that you can find here.
I hope this was a help for you and that we see echother in game (even if it may be in battle 
)