Trigger to pause timeline on a slide than restart if condition is met

Hi Guys,

So I have a slide with 3 text field that the students need to writing something in it in order to see the next paragraph of text appear in the same slide.

So I m trying to set up a condition that when the first field is empty the timeline stop.than if the student click next a second layer will appear for 3 sec saying please fill up the field. But this should have him stop on this time line until he write something on the field than the second paragraph will appear with the second field and again and again until all field are full. if this make any sense 

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