Skripts needed | Scoreboard | KillReward | (Killstreak)

[GalaxyBlurry]

I am looking for a few specified skripts for my server.

-Scoreboard
info: Layout:

Servername
Prefix
kills

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Kill-> reward:
If you kill someone you get 1 emerald.
If you attack a player that has a killstreak of 5 you get 2 emeralds.
And that always +5 killstreak is +1 emerald.
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Killstreak skript if needed for the kill reward skript.
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Gen skript:
A coal gen named &0CoalGen. You dont need to remove or upgrade it its just for creative to pick and sell.
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Ty.