For random combat (a bit more detail): Set all the squares in the area to the same zone. Then, under "step events" choose "step event 1" and tick the zone you have used. In the Event Editor (down the bottom of the event editor), expand the "Step events", then "step event 1", choose "random event" and click "add".
Give the event an event trigger of "random chance" and set the "Chance %" value as about 1-10%. In the random event, set the values to whatever you like (just not zero). Then in the event editor insert combat events on as many of the "random chain #" event spots as you like.
Sorry if that was too basic but I think it can be hard to find your way around all the features.
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