There are various files in the Data\INI\Object folder called eg. AmericaInfantry.INI, ChinaVehicle.INI...
These are the "Unit.INIs" you've asked for, theBuildings are in FactionBuilding.INI !!
The Parameter "Side" in the "Unit.INIs" defines which faction your new unit belongs to.
Turrets don't need to animated, the engine provides a logic for that!
You just have to link,all subobjects that should move with your turret (eg the barrel) to the turret itself, then again in the "UnitINIs" there are entries called conditionstates.
Open AmericaVehicle.INI. search for the PaladinTank.
Then search for eg conditionstate = damaged.
You'll see various parameters beneath!
The model that should be used for that status of the unit,
also the animation (if there is one) and there are also verious parameters for bones that are used:
ParticleSysBone (for particle effects like explosions and smoke), WeaponLAunchBone(guess what this means) and so on,
also you'll find a parameter called "Turret="
There you'll have to put in the name of the subobject you want to become your turret (and you've linked the barrel to), that's it!
For the future I would suggest to download all tutorials from the download section first (and probably some from GenDev at Revora, too).
The questions you've had, have been answered many times before (not by me, I just tell you because you've started quite many threads in the last few days
)