initially it will cost 3k and ull get WoW Classic + The Burning Crusade Expansion
and 30days game time ( u can add 10 more dayz with the free trial)
then its 15$ for 1 month game time
30$ for 3 months
mind u u wont need WotlK even on retail until u reach level 70 which culd take over 2 months for someone new to WoW
WoW Classic : Level 1-60
Burning Crusade : 61-70
Wotlk : 71-80