At the time of writing, WoW Classic is Wow gold classic presently on Phase 5 of this PVE content schedule (see below) and the Ahn'Qiraj raid was unlocked so, once you reach maximum level, you will have access to a range of raids and World Bosses to tackle.
If you think you are prepared to play World of Warcraft Classic, you will want a subscription to achieve that. Unlike contemporary Warcraft that enables you to produce as many characters as you enjoy and play with them around level 20 without subscribing, if you are after the vanilla encounter, you will need to put your money where your mouth is. The good thing is that once dispersed, you'll have access to both Classic and contemporary Warcraft.You can pay a month at one time or you choose to cheap classic gold subscribe to longer which will work out slightly cheaper.