At first, you should get to Hellscream's Reach - Honored,then you can exchange Tol Barad Searchlight from Vendor: Pogg in Tol Barad Peninsula by spending 40 Tol Barad Commendation.
1.You will get Tol Barad Searchlight.
2.You need to provide your account.
3.Your character needs to be lvl 50.
4.Estimated time: 1-3days.