Hey @DimeurgRi!
Personally I would set it up like this:
Have a variable Integer called “Actions.”
On turn start: Set Actions ->3
On any action (Move, heal, attack) as part of that code on the unit, check for “Action > 0” and do the action, then “Set Action → Action -1”.
The UI parts and the actions themselves can be cannibalized from nearly any other style of game. You are unlikely to find a tutorial giving you a Baldur’s Gate 3/Divinity style system as a whole (fire emblem maybe?) but you should be able to find bits and pieces throughout our tutorials here on the Epic Dev Community and Youtube! Try looking for specific things and going one at a time.
Don’t worry about the action economy yet- start with making the actions, then you can make a function as I outlined above (Check action count and decrement action count) for reuse!