I am however still confused if all this takes place in one turn?
This all takes place in a single turn.
So, basing on the above, Galvanize should look like: Place the order token(s) to Charge on some Unit and at the same time place the order token(s) on Shaman to activate Special Trait - Galvanize?
That is correct.
There are three types of special traits:
1. The ones that simply work (like Fast or Skirmish).
2. The ones that need to be activated in combination with another action (like Excite or Galvanize).
3. The ones that need to be activated stand alone (like Control or Heal).