If you buy monthly - 30 days, 3 months - 90 days etc.
Currently, it's 82 member worlds in all of RuneScape, whereas 5 is in other languages.
It say on the Runescape site how to become a member.
no if u pay for a member it counts as 30 days not a month so no matter when it is it will count down from 30days
RuneScape subscription is when you suscribe and you become a member.
no
No
They are a non-member/ free player.
Godswords are member only items.
You can't.
no
No.
no