You can keep track of kills per player with a trigger on event Unit Dies and a variable to track kills. Then you can reward the player however you like when they reach an arbitrary number of kills.
If you want each unit to get stronger based on its own kills, it makes more sense to use the built-in experience system. If you want players to be able to "spend" their kills to buy upgrades or whatnot, I recommend a bounty system (Data: Unit: Kill Resource) and using resource to buy things.
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@Phenom36: Go
You can keep track of kills per player with a trigger on event Unit Dies and a variable to track kills. Then you can reward the player however you like when they reach an arbitrary number of kills.
If you want each unit to get stronger based on its own kills, it makes more sense to use the built-in experience system. If you want players to be able to "spend" their kills to buy upgrades or whatnot, I recommend a bounty system (Data: Unit: Kill Resource) and using resource to buy things.