1. Look at how the auto harvester does it, it simply uses a Text type actor. If you want the text to move upwards too you'll also need a Site (mover) actor.
2. If you want the text to change based on the mineral kill value of the unit then you would need a lot of text actors for every mineral value that is used. If you don't want to use a lot of actors, then I would suggest triggers instead. The basic principle of making the text appear is the same as 1.
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AMtrane Regular ShmoeI want my game set to where whenever a probe return a mineral the nexus , the nexus shows "+5" in blue , very similar to the auto harvesting gas from the SC2 Campaign, or when you kill a unit (if the unit has kill mineral value) it would show as +x Mineral in blue