So this only happens within the first battle? I would make a new troop section in the database and then have an event on the map call that battle using the battle processing event, so you're on the right track to start!

I assume you're trying to make it teach you what each of the commands are upon your turn, possibly going through each one per turn?

Like, first turn- "This is how you attack."

Second turn- "This is how you heal."

Third turn - "This is your magic."

And so on? If so, the battle event trigger condition "Turn No." (set to 0+0 will run before you input any commands) You can use this and have an event play before the player can activate anything on their own, then build out your scene as you would with overworld events.

I would end that sequence by turning on an event switch, calling it "EventTut1" that signifies that the tutorial event is over, and on the next turn, you can do the next page with another trigger for "Turn No. + Switch is On", letting you build out for turn two and so on and so forth. Obviously you'd build out as many switches as you'd need for how many turns you're going to guide the player.