First of all, i don’t have yet everything polished within my Guide, but i will keep on update and will set the Guide on my Youtube Channel Killerduki
This is Guide on how to experience the game itself on complete and full Adventure.
The most Challenging thing in this Guide is if you do that on every single Class (i put my bet it will be impossible for you, regardless how hardcore player you are).
Alright, let me begin:
I will make you short list because i don’t have the guide written:
Zones for Quest search on Wowpedia
Also make sure to have questie addon fully updated which includes low lvl q’s, because there are hidden low level quests in Durotar near Orgrimar as Alliance
complete all 1-10 level zones
switch to all 10-20 level zones.
Now , before you step to next level Dungeon, make sure you get all the items you have as an upgrade for your spec from the current dungeon
Example (get every item you need from deadmine, before you go to shadowfang keep etc).
Once you complete all 10-20 level zones quest.
Do the Dungeons:
Wailing Caverns
The Deadmines
Shadowfang Keep
Blackfathom Depth
Stormwind Stockade
Gnomeregan
Then get the Warsong Items from Warsong PVP (optional).
Now next step, go for 20-30 level zone quest to complete.
If you get some unexpected quests from previous dungeons you completed, you are free to do them while doing the Quests before you go to next Dungeon List.
Do the next Dungeon list:
Razorfen Kraul
Scarlet Monastery (all of them)
Razorfen Downs
Then get the Arathi Bashin and Warsong Items from PVP (optional).
Now get level 30-40 quest zone to complete and grind best reputations from Desolace from one of the Clans (can’t have both at same time).
Do the next Dungeon list:
Uldaman
Zul Farrak
Maraudon
Sunken Temple
Now get level 40-50 quest zone to complete and perhaps do the Hintherland Reputation farming if possible.
Do the next Dungeon list:
BRD
LBRS
Dire Maul (all of them)
Scholomance
Stratholme
UBRS
Now complete all of 50-60 level quest with Silithus as last.
You have bis pre raid Gear now including Dungeon 2 set (if it is your set for your spec).
Now farm reputations like Timbermaw,cenarion Circle,Wintersaber,The Neutral Cities like killing Pirates etc.
Begin to Raid similar way as Dungeons you did, get all the Gear before you step to next level Raid written on the List
(if 20 mans are already Active).
Zul Gurub (make sure you complete all of their quests and rep max before aq20)
AQ 20
Onyxia
Molten Core
BWL
AQ 40
Naxx
Everything is completed, now do pvp to get max rank Gear 
Game is finished and completionist is done.