If you enjoy the levelling experience, here is a list which will hopefully make your WoW Classic leveling journey through Azeroth a little easier.

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Choose a PvE server
PvP servers can slow you down if your priority is hitting max level as quickly as possible. The minute you start levelling in 'contested' zones on a PvP server, you run the risk of the opposing faction deciding that you're a more tempting target than the quest enemies. While this works both ways, it can become tiring if you're just looking to complete the area quests and move on.

Pick a Damage dealing class
Picking a class that's sole purpose is to deal damage is going to help you level faster than choosing a hybrid class that can perform a variety of roles. While other classes may be 'safer' thanks to their damage reduction (tanks) or healing skills (healers), these tend to dole out less damage than classes whose primary role is getting stuff killed.

Make a choice about professions
If you choose a profession that turns over a profit on the auction house, you'll stand a much better chance of affording that mount and Riding Skill when you hit level 40 which will, in turn, speed up the last 20 levels.

Learn First Aid
First Aid is a secondary profession that is incredibly useful if you're playing a class that doesn't have any self-healing abilities. You'll pick up a lot of cloth as you level and this can be turned into bandages with First Aid, allowing you to heal yourself up between fights and cutting down on overall downtime.

Consider making a bank character
You can vendor it for a bit of extra silver, ready for when you can purchase your Riding Skill and mount at level 40. Except junk, you'll loot crafting reagents, cloth, and the odd bit of gear. This is stuff that you should probably not vendor as it could be used by a profession later or sold on the auction house for some extra gold. Setting up another character to mail the excess stuff to when you pass a mailbox means you can free up your bags and worry about that stuff later.

Kill everything 
You'll be doing a lot of travelling in Classic and to make use of your run between quest-givers and objectives, you should kill enemies you find along the way for some extra experience. Obviously don't go out of your way to locate them but if you find a boar or two between you and your destination, don't skirt around them.

Level solo if you can
Levelling with friends or in a group is more fun but if you're happy with your class and the speed it can kill stuff, you're better off levelling solo. Experience gained from killing enemies is split amongst party members so unless the area is overrun with players hunting the same quest enemies, you're better off alone.

Don't forget rested experience
When you're logged out within a city or an inn, you'll gain rested XP four times as fast as you would if you log out anywhere else. And as rested XP gives you 200 percent bonus experience on kills.