I'll answer the ones i can (should really be done by an Osty though
), but i avoid pve when i can as it's just a boring repeatative side of the game that holds little interest, so i'll ignore the questions you asked that i cant answer
5 - Generally most new xtals will be bought out in the dreaded 500 tcoin boxes.
6 - It's very difficult these days, since the 5% BF dailys was stopped at the 85 cap few people go to battlefield. Realistically the only way to get honour is raiding / defending / capping relics.
7 - If you are between level 71 - 90 it is incredibly easy to rack up kills, get some half decent gear and go to the arena that is held 4 hours apart from eachother and watch the kills roll in.
8 - Depends on your nations, Ostys real active time (from what i've seen, and im a western european player (from Vanov)) seems to be late evening for us and onwards
9 - I think it was the 85 cap or midway between 85 / 90, some xtals had a few more stats added onto their current numbers, so xtal names / descriptions may not match what they give (just take notice on the line of stats the xtal says it gives), but the basic speed cap is still 70 (not including wrwrwrwring)
10 - Stat caps? didnt know we had stat caps :O
11 - You may find a few, from 2 years ago there are quite a few, but they will likely be focused in the stronger nations like Feo
Welcome back :O