What do you mean? You level up by getting experience from killing creatures and doing quests, which you level up with. You just get enough experience to get past level seven!
If that's not what you mean, then i don't know. Your character's levels are the only 'Levels' in the game, this is not a game like Mario or something where you have different 'levels' to complete!
You can not get to level 507 on World of Warcraft. World of Warcraft is actually only written to go up to level 255 and that level can not be obtained.
Yes, a level 52 is able to get into Sunken Temple in World of Warcraft.
Currently in Mists of Pandaria, the latest expansion to World of Warcraft, there are 90 levels.
One can purchase max level World of Warcraft accounts from a site that offers the services of selling World of Warcraft accounts. One example includes "BuyMMOAccounts".
25
A level 60 raid.
?? boss
wetlands
Level 14
Level 65 is required in order to obtain and use the gunblade on World of Warcraft. The gunblade is dropped by monsters whom are in the mid-65 level range.
Tanaris
Outlands..Hellfire Peninsula
Incinerate can be learned at level 64.