questions about the point system

hey guys i was wondering if you could help me out with my questions about the point system
i just got one of my characters to 1k achievement points and immediately collected my store points for today so my questions are these:

i have multiple characters right now, with one character having 1k achievement points (highest one). for calculating the store points awarded to me, does the system base it on the highest achievement point, or add them all up?

what time does the "day" end?(or which time zone)

do i have login ingame to collect points? if yes, how long do i have to stay online?

and whats the best way to earn up store points(aside from being a donor)? focusing on one character or using multiple characters?

thanks! :)

1. the system it counts the same Achievement only once, example: if you have the same achievement with a Char on MoP and on Wotlk the system will count it only once
2. check the "time" on the WArmane frontpage, at 0:00 you will be able to collect new points
3. you do not even need to "enter" with a Character, reach the Character Screen selection and it will be enough
4. if you have a fly mount I would recommend the "explore" achievement, once you do it all you will get around 1k achievement points. Focusing on one character

thanks for answering!