Actually, all of the previous response were incorrect.
The Turn Markers are randomly placed on the Bid Order Track.
Once you are ready to start the game, you then bid on who will go first.
The randomness of the Turn Marker placement only accounts for who will make the initial bid, to start the game, first.
You can find this under "Setting up the game" on page 2, and "Game Turn" on page 3 of the instruction manual.
I hope this helps. I also thought the same as everyone else, but after not having played in a couple of months, I wanted to refresh myself with the rules and stumbled across this.
Thankfully, the first response from Aernout already had this covered.