after fooling around last night with some buddys we stumbled across this after a while, if this has already been posted my apologies, i did a search for "tol barad gravejard" and it did not give me any results so here it goes ^^
First you follow the red marking on the picture you just jump from the little hill where the big black square stand and keep on jumping and you will end up where the other black square is. Now you need to mount up and jump to where the green line is leading.
Now what you do is unmount and run and jump along the way where the red line is showing, that will bring you to where the black square is from there, you will need to jump up from the very far right side up to the next hgher platform.
from this point on you should have figured the rest out by urself already, you are just one jump away from camping/ganking the respawning ppl ^^
sry for all the black squares but oh well had to remove the ppl in the shots ^^
if something was unclear just ask ill try to explain it better
/edit
its the gy @ ironclad btw ^^