yes you can. you have full privilege like everyone else. but im pretty sure u cant venture into outlands though.

not sure whats inside the battlechest, i bought the game way before expansion. they would probably notate on the box whether they have playtime included or not. usually they are quite careful with that. I remember my pre BC box comes with 2 months free play.

no need. but of course u can ask the seller le if u want to confirm.