There are three main sections you need to set up for every tactical battle. I'm using the original Japanese version, after a fashion (did some edits of my own) but the format is the same:
The big one is the script "After Battle", it should be right below the "Basic Customization" script.
In here, for every map, you need to configure what happens after each battle. There should be one already - your demo map.
Basically, for each battle map you need to fill in a when case, with an array. Like so:
when [Map ID goes here - right click on your map, go to properties, and it's at the top - make sure to leave out any zeroes)
Nextmap = [MapID, X, Y, Tactical Battle, Common Event] - basically, you put in, in order, the ID number of where you're going to, the X and Y position you want the player at. Next one is true or false, you just tell it if it is a tactical battle or not. Common event is the number of the common event you want to run after battle.
Defeat = [0] - put it as a zero for game over, or the same as the next map above if you want an unwinable battle / the story to take a different path if you lose.
In other words, you'd have something like:
when 5 # Introduction Battle
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