For NPC's, make an event where you want them to be, and set their graphic to the NPC you wish. To make one speak, turn the event to action button, and do the text command.
Battles are set in the database under troops or something, I believe.
Preset battles should be started with an event command, battle processing, I think.
Hmm... Too many "I thinks"
I haven't used it in a while, I need to refresh my memory.