It is really up to you. If you want your dragons to become more powerful, 20 more damage per second and 200 more hitpoints, then upgrade the dragon. If you want to be able to train P.E.K.K.A's then upgrade Barracks to level 10. But you could actually do both at the same time. While upgrading barracks to level 10 (2 million elixir), upgrade your dragon to level 2 in the laboratory (2 million elixir).
1500000
Barbarians, Archers, Goblins, and Giants
2,750,000 elixir, but you get witches.
15 laks it upgrade and 30000 to make it
2,000,000 elixir (2 Million)
yes
eubie
No, Clash of Clans is not available for Nook.
There are no codes in clash of clans.
There is no "best" base in clash of clans.
No, you must have an internet connection to play Clash of Clans.
I got working cheat for clash of clans here: deluxesave.com/clash-of-clans-hack/