Or if you are really setting your goal for it, maybe even get you it!
Disclaimer: This is not for noobs, you must be very experienced with your class, World of Warcraft, fast leveling in general, and you must have the time! This will not work if you are not ready at LAUNCH time, you can not excpect to get realm first if you go to sleep early and then go to school before starting the journey to 90!
Preparing for MoP Realm First:
Things you will need :
#1 Reliable network
You must be 100% sure that you have your network ready for the launch day. One Disconnect and you risk your realm first achievement right there!
Having 1000ms won't help you very much aswell, make sure you have closed every download / porn sites / YouTube or whatever that might cause you to lagg more than wanted.
#2 Food, Energy (Drinks / bars etc)
Even tho you are going for realm first, you need to stay hydrated and not starve
This is pretty self explanitory but you cant spend 30 minutes at level 87 cooking food because you get hungry. What I like to do is to make some awesome taco before launch and eat me full and then wrap some more so I can eat whenever I get hungry, just put it in the microwave for one minute when you have any idle* time on WoW. *Idle time is a time where there is some cinematic. You probably remember the first time you went to Vasj'ir and had to sit on the boat for 3 minutes doing nothing. This is a good time to go to the bathroom and get your food heated up in the microwave.
#3 Privacy
Tell your wife / friends / your dog or whoever you may live with, what you are doing. You dont want your girlfriend charging into your room dragging you to shopping or your boyfriend begging you for le sexy time. So make sure they know, you don't want ANY downtime!
#4 Have the client downloaded!
Make sure you have downloaded the game before the launch! Open the launcher and it will start download (They have allready made the game available for download)
#5 (Optional) Some good music!
What I like to do when playing games is to turn on my kick ass surround sound system and fire up some awesome music! This makes the gametime more fun and less boring
Spotify is a great way to setup music for your gameplay, just make an account on Download Spotify - Spotify (I highly reccomend getting premium so you wont have any commercials between the music which is really annoying trust me.) Make your playlist and put it as "Available Offline" so it wont use any uneccesarry net.
In-game Preperations :
#1 Keybindings
Make sure you have keybindings for targetting and interracting with friendly NPCs, this will make it much easier if there are alot of people blocking the quest givers etc.
#2 Addons
You dont want to spend alot of time clicking accept and and complete and all that, Turn In lets you skip all that and makes you a couple of seconds ahead.
Turn In - Quests & Leveling - World of Warcraft Addons - Curse
You dont wanna stop for 10 second figuring out where to go looking at you map. Mapster gives you the ability to have the map open while running around questing.
Mapster - Map & Minimap - World of Warcraft Addons - Curse
Make sure all your addons WORK on the Beta, you don't want your addons to crash your client while playing the game.
#3 Daily Quests
Make sure you have 25 daily quests and preferrably normal quests besides that.
I will have the comment below reserved for full guide on all the quests you can get and deliver when MoP hits.
#4 85 Heirloom gear *Note: this is not tested, but it worked at Cata launch!
In Cataclysm only 2 new heirlooms was implemented, the head and the cloak (80-85) Im 99% sure this will work in MoP. Basically since its 80-85 it means you can use it in 85 aswell to gain more exp untill level 86.
#5 Flasks / Potions / Food and inventory
This is pretty much self-explanitory. Clear your bags of trash, put useless stuff in your bank and buy alot of potions, flasks and buff food.
The more buffs you have, the faster you will level!
#6 Level 25 guild
Make sure to have a level 25 guild for the extra experience points and to setup dungeon groups before launch.
Beta preperations :
If you don't have beta access, buy it from someone on the forums, get it from a friend, just make sure you have it! If you don't...well then you could pretty much give up allready.
#1 Talents and gear
Figure out the best possible spec you can have. Get BiS gear, the better gear you have, the more damage you will do and the faster you will level up.
#2 Read up on your class
MMO-Champion - World of Warcraft News and Raiding Strategies
Mmo champion have all the updates on every class, I won't teach you how to play, so go read up on that site if you are not 100% sure of what changes gonna hit in MoP and how you will handle that.
#3 90s everywhere!
Go to Battle.net -> Summary -> WoW Beta -> Beta Character Copy -> and copy your char.
Now what? Level it up, level it up 10 times, level it up 100 times. Level it up enough times so you are 100% sure your method is the fastest!
Ask other 90s their /played time and if they did it faster then you? Well guess what, level your char more!
Optimizing your strategies :
#1 Figure out the fastest way to travel
Where should you put your HS? Figure out the best times to change zones. There are many items in-game that lets you teleport to different places around Azeroth!
#2 Enchants and Gems
Keep enchants and gems in your inventory to enchant your new gear. Every oppertunity to gain more dps is an oppertunity to level faster!
#3 Don't kill uneccesarry stuff!
Don't stay around to finish that 1 extra mob you pulled after completing the neccesarry stuff for your quest! Are you a rogue? Vanish. Are you a hunter? Feign Death. Are you a druid? Dash away. Effectivity ftw!
#4 Practice!
Don't stop with the Beta playing until you are fully satisfied with the speed and effincency of your leveling method and you are sure you will get Realm First with that exacy method!
Bonus:
MONKS ONLY!
If you plan on getting realm first level 90 Monk, you HAVE to do the RAF to get your monk to level 81 ASAP!
Basically, just kill a couple of mobs at level 1 and then grant to level 80. And after you have granted that last level. You will be level 80 and have 99% exp for level 81