Why the rush?
It is a game; the journey literally is the reward. Level 80 is just a teeny tiny part of a vast expanse of game. People literally played the game for years before you could even get to 80 ;p Try taking your time and really reading the quest text as you level up. Heck, even put on the sound. They put a lot of work into this stuff, and if you look at it, it is actually quite fun.
Tips for leveling more efficiently:
-Try getting a leveling guild. There will be people who can give you advice on where to quest at what level, and you may even find a leveling buddy or an occasional run-through.
-Make sure to always have the best food and water available at your level, it cuts out a ton of down-time.
-Pick quests that are green or yellow to you, avoid the orange and don't do them when they are red. Doing slightly lower quests greatly reduces the amount of time spend drinking/eating, and will make you far less likely to die (which of course costs both time and gold)
-Check what instances you can queue for, then go to Wowhead and see what quests are easily available for it. Then put yourself in queue for a random dungeon and world quest while you wait for a group.. It's really the best of both worlds, the lack of down-time of questing, put together with the gear and amazing quest xp of dungeons.
- Wowhead and WowWiki are your friends. Your best friends. They have information on all kinds of game things, from 'Where do I go for this quest' to 'How do I level this prof', 'Where is the glith path in this zone', 'Where do I get 'x' item', and 'What spells should I be using'.. Really, anything you could want to know.
Best of luck, and have fun leveling!