Firstly, although the Destiny 2 servers were slightly rocky right around 5 am EST when Xur first appeared in the game, you should now be able to find him without too much interference. If you are in search of the vendor who possesses exotic items, armor pieces and weapons, this guide aims to help you not only find him but what to buy. This is XUR's first appearance in Destiny 2, it was an awaited event and he finally came. This week, he's near the Watcher's Grave fast travel point on Nessus, and there's a helpful icon on the planet map to show you where he is.
Destiny 2 players are just now able to interact with merchant Xur in-game, after waiting an extra week before being able to seek him out and purchase items from him in-game.
However, those new to the game should understand that you need Strange Coins and Motes of Light to buy items from XUR: Agent of the Nine.
If you want a quick rundown that explains each armor piece, then you are in luck. The Warlock Wings of Sacred Dawn chest piece lets you hover in the air while ADS (aim down sights) upon landing a precision hit, which increases hover duration.
Xur will sell you Exotics, which you need to pay for with Legendary Shards, that you can get by taking apart Legendary and Exotic items you obtain during the week.