Does placing your first piece count as your first turn or is that part of setup?
I always assumed it was move #1, but playing on Boardgamearena, it seems to count as setup there.
Interesting question! I thought the answer was "obviously" that the first placement is your first turn, but looking at the rulebook now, it is indeed not 100% clear.
"Play begins with one player placing a piece... and the next player joining a piece... Players then take turns..." could be interpreted to mean that the "turns" begin after the initial setup.
Arguably "players continue taking turns" would have been clearer better wording, instead of "players then take turns".
(The setup indeed does not follow the normal rules of placement during a turn, i.e. the setup violates that as a placement during a turn you must place next to a friendly piece and not next to an enemy piece.)
I'm still betting that the initial placement is your first turn, though.