You will have to talk with flight masters in most towns or cities you visit in order to gain access to that settlement's flight path. Flight masters who have a stop you have not yet unlocked will have a green displayed above their head (and on the mini map), much like a NPC with a quest. Unlocking flight paths as you progress through various zones will allow you to pay for a quick ride to a destination you have previously visited. This method of travel is significantly faster than walking or riding a mount.
Even though a modern server architecture is used, Classic servers won't have the same features that current World of Warcraft does. There won't be cross-realm servers or Looking For Raid and Dungeon Finder automatic party matchmaking. There are still a lot of questions about how the team will tackle it. This endeavor is being undertaken by an entirely separate team at Blizzard from the one working on World of Warcraft and its next expansion.
As I wrote in my preview, World of Warcraft Classic has much more to offer than just nostalgia. The world is filled to the brim with abstruse and challenging elements that coerce you to make and maintain relationships with other players if you want to succeed. As a result, I believe that WoW Classic’s MMO ecosystem offers an experience that can’t be found anywhere else in 2019. And, it would appear I’m not the only one who sees something special in the more-than-decade-old game. Just last week more than 100,000 viewers congregated in the chat of popular streamer “Asmongold” to watch him successfully fell Edwin Van Cleef in the classic Deadmines. A vindicating spectacle that would have been impossible to witness without Blizzard overcoming certain technical hurdles.
The quickest way to level up is to travel through the game's zones, completing all the quests you encounter along the way. Completing quests grants you Experience points, which will slowly fill in your experience bar with blue or purple. When the bar fills, you reach the next level. Alternatively, you could choose to run Dungeons or Battlegrounds, which are not covered in this beginner's guide.