On the trial version here and I've heard and read some things in passing that I've questions about.

1) what are Tomestones?
2) what is the ideal path I should take after lvl 50 if I want a strong Dark Knight? Like should I do raids X and Y over and over, or farm something in particular?
3) If I glamour using the projection of a PVP gear onto PVE, do I have to maintain my pvp rank to keep wearing it?
4) what's a good way to earn gil late game?
5) do I have to take up a crafting class?

Thank you