The Sunhawks are a group of blood elves loyal to Kael'thas Sunstrider who commandeered the Exodar before the draenei, led by Velen, stole it back. A small group of them were led by Sironas in Bloodmyst Isle. Among her plans, Sironas had begun using the remains of the ship's Vector Coil to create a Sun Gate, a dimensional rift which allowed for a steady supply of reinforcements to be shipped from Outland. They wished to reclaim the Exodar and seemed to want to turn the draenei into man'ari eredar. They have since been disbanded by adventurers sent by the Hand of Argus.
The members use an ability called Mark of the Sunhawk
The Vector Coil, the Sunhawk operation's center
Where to start? Well, somebody would say all the way back to Warcraft I (aka Warcraft: Orcs & Humans or the First War), or maybe Warcraft II (aka Tides of Darkness or the Second War up to and including Wrath of the Lich King, Warcraft III is the best place to start. Also, this game then elicits more interesting questions. For instance, how Illidan Stormrage became so hated or where the Scourge started. You will learn all the history and geography of the Warcraft with our help and dedication.