At the time of writing, WoW Classic is presently on Period 5 of the PVE content schedule (see below) and also the TBC Classic Gold Ahn'Qiraj raid has been unlocked so, as soon as you reach max level, you will have access to a range of raids and World Bosses to tackle.
If you believe you're ready to play World of Warcraft Classic, you will want a subscription to achieve that. The fantastic thing...
English
Arabic
French
Spanish
Portuguese
Deutsch
Turkish
Dutch
Russian
Romaian
Portuguese (Brazil)
Greek