OK, here, go to ironforge and jump into the giant lake of lava, at the bottom of the lake there's a small stone you can click, clicking on that stone will empty the lake of lava letting you run about it freely, once the lake is empty, go to the farthest end of the lake (nearest to the throne room) and run through a small tunnel. at the end of the tunnel you will find a gnome named raiding, talk to him. he'll give you all the xp you need to level to 60, as well as your epic mount, a full set of tier 1 epic armor, your choice of an epic sword or mace, and an instant membership to an 80+ man raiding guild.
now, a mean person would tell you that and leave it be, and if you happen to actually believe that statement, then stop reading this and go try it.
still reading? well, honestly, the statement above is compete hogwash and the reason you don't start out at level 60 is the simple fact that you don't know anything about your class. Blizzard wants you to level yourself up to 60 (well, 70 now) so you can learn your class, so you know what do do and when to do it. If you were to just hop to 60 you would miss the best content in the game, this coming from a level 64 warrior with experience tanking molten core and the head warrior officer of an 80 man guild, I can honestly say that the best moments in the game for me happened around levels 20-40, not 60+.
Enjoy your leveling experience, don't rush it. But I can give you some advise.
-Don't worry about having the best gear until you've reached the level 70, at lower levels anything you wear will be replaced within a few levels, so don't spend every penny you earn on new gear. Go to instances, and do quests, that's where the best gear is to be found.
-Stay away from the Auction House, unless your selling something. Don't spend all your money at the AH, the only excuse you should have for buying something there is
1) Its to further your crafting profession, or
2) your replacing something that's well over 10 levels old
-Read the manual
-Read the official world of warcraft forums, and ask questions
-Look for helpful guides if you ever get stuck, I suggest
wow.allakhazam.com/
Linkfor items and quest help
and
wow.tentonhammer.com
Linkfor helpful guides and FAQ's
and let me know if you have anymore questions.