You can't.
Yea you can't get cherry credits on Adventure Quest Worlds.
But you can get something similar to cherry credits.
You can buy Artix points.
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simply go to www.mobius.com.ph
Kuro is the boss in the river in aqworlds.
You can't exactly be a Guardian on AQWorlds, but you can verify on AQW that you have Guardian on the original Adventure Quest and get Guardian class in AQWorlds. :)
You have to link your Dragonfable Dragon Amulet account to your AQWorlds account.
You get Paladin class in AQWorlds from Artix in Swordhaven (he is found in the inn).