I did my first 8-man party runs as a WAR OT and both went fine but I realized about midway through Castrum Meridianum that I had no idea what I was supposed to do as OT and just sort of rolled around like an idiot. I decided to rectify this by doing some research before the next queue but I still don't really have a clear idea about what to do.

I know OT is often responsible for keeping aggro on adds during the bosses but both times, a healer insisted to kite the adds so I just DPS'd because I didn't know what else to do.

Is there a specific thing I should be doing as OT? What little I could find with the amount of time I had before just gave skill rotations, which is cool, but if I'm supposed to be doing certain duty as OT, I would like to actually do it instead of just becoming another DPS.

On that note, any general tips on both roles would really help. I'm very new to this stuff (first MMO + just barely got to level 50) so every little bit helps. Thank you!