Hi, so I've just got my first lvl 50 class, and I have a couple of questions
1) I notice I no longer get any xp for killing stuff, is that it, can I go no higher?
2) when I hit lvl 50 the game told me I could now accept the next class/job quest, cool but if I do them can I go up a class or not.
3) Now I am at lvl 50 with my dragoon should I push on and finish the story missions or level up another class? Bit of a daft question I know, but I am really enjoying the story and since this has been my focus since a came back to the game I am a little apprehensive to finish it now, as then what will I do?

As always thanks in advance for any help or tips, this forum is so helpful, it humbling.