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 leveling guides on my site are essentially speed leveling guides. My leveling guides are the same guides I use myself to speedrun to 60 on new servers to get 60 server first. I list many occasions where I tell the player to "die on purpose" to go faster. I tell the player to skip certain quests, because some quests are just not worth the time/XP. I list tricks and shortcuts to go faster so you can reach level 60 much quicker. I am still constantly going through them over and over again perfecting the guides to make them faster and easier to follow. For the most part, the guide can be followed without the need from other player's help, as the whole guide was made from a solo run anyways. Although I do list quests that can optionally be done if you have a group.
The notion of ongoing updates as they originally appeared, though, raises the question of expansions. Blizzard has released seven expansions in all. And while later ones like Legion or Battle for Azeroth would feel out-of-place within the Classic framework, it stands to reason that some players may want to experience earlier expansions--such as The Burning Crusade or Wrath of the Lich King--in the context of World of Warcraft Classic. Blizzard isn't committing to this, but also hasn't ruled it out.
Kaivax, a WoW forum community manager, revealed that WoW Classic's class design, battleground mechanics and stats on existing items will be set to their 1.12 state, despite the game releasing content that expands beyond that. This removes "progressive itemization," so if the stats on a specific piece of equipment was changed during the original updates, that won't take effect in this version.
Fifteen years of iterative design means that the World of Warcraft that existed in 2006 is dissimilar to World of Warcraft: Battle for Azeroth as it exists in 2019, even if you’re playing the same content. The cumulative effect of thousands of tweaks means that pinpointing exactly what made Classic so special is a nebulous undertaking. Flying mounts, for instance, were a welcome addition when they were introduced in The Burning Crusade. It eventually became clear to players, however, that the convenience and fantasy they offered came along with a number of significant drawbacks like reduced interaction with topography, enemy NPCs, and other players. In spite of this, flying limitations are met generally with negative feedback on the part of BFA’s community. Such conveniences are difficult to unlearn.
You can also make good gold for opening lockboxes, park yourself in a public place like Ironforge Commons or Orgrimmar near the Auction House, and let Trade Chat know you’re available. You can even make gold by offering to stealth in and pick the Shadowforge Lock open in Blackrock Depths! You’ll need to level up your lockpicking though, so work hard on it like any other profession. Try Redridge, Wetlands, and near the coastal nagas in Ashenvale.
I think that the token is a nice solution for the problem. Back in the days, blizzard tryed to ban gold sellers, but it was a lost cause. Instead, the token seems to have resolved the problem, letting workers that want to raid with consumables and stuffs to have the golds to do it. Personally, I don't find the gold buying really fair, but I understand that for many people is a necessity and I prefer to leave the economy and the farming spots to the player instead to the gold sellers.