Hi!
so let me answer to your questions ^^

What should members do for airdrop(if it exist)? we don't do airdrop but we have a bounty program! you can check all informations you need here on our bitcointalk thread: https://bitcointalk.org/index.php?topic=2620895.new#new
you doing airdrop or not ? already answer ^^
When you will start to sell or market? The token will be tradable just after the token sale, more news will be announced about that soon, so to keep up to date follow us on Telegram!!! : https://t.me/Dether_io

Merry Christmas! :)