You can’t go wrong with a mage. In fact, Mage was the most popular class in World of Warcraft: Classic due to their ability to farm with ease. Back in the day, the player majority even leveled mages as alts in order to gather gold quickly. In addition to their monstrous ranged DPS, mages also have tons of useful utility. As a mage, you’ll be able to conjure food and water, place portals to the major cities, and even earn gold from doing so.

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.
WoW: Classic is scheduled for August 27 (technically August 26 if you're in the Americas). The soonest that you can play it is starting in May, during Blizzard's scheduled stress tests. To opt-in you must have an active subscription on your account. If you do, go to Account Management and select the Wow Classic beta. Keep in mind, there will be level caps during the test. The schedule is as follows:
Similarly to Alliance’s Paladin, Shaman is a unique class option for Horde. Shaman boasts amazing group utility with its strong buffs through totems. Windfury totem is a must in any raid while Bloodlust in Classic is unique to the Shaman class. Restoration Shamans were considered the best group healers while other specs were also amazing in PvP environment capable of dishing out insane burst damage. Additionally, Shamans were able to wear mail armor, so any piece with spell power on mail set piece was almost certainly yours.