Hey, just came back and bought the expansion to give it a try

1. If I leave a company, what happens to my private chamber and all the items I got in it?
2. I got the early access code for heavensward, is there a specific time for when the code for the full game will be sent?

Could also use some gear/quest advice, right now I'm sitting at ilvl 96 bard, and the expansion release soon. I'm at the keeper of the lake quest, do I need to complete that for expansion? And is there any point in grinding gear right now, or will the expansion gear replace it anyway?

Thanks in advance