Hey sami, can u help me setting up the reward work with economics pls ? 

Hello,
You have 2 choices, the first is to use the command :

/running add <Package Name> money <MinAmount> <MaxAmount>​

{
  "runner": {
    "Moneypackage": {
      "RewardItems": {
        "Money": {
          "MaxValue": 1000,
          "MinValue": 100
        }
      }
    }
  },
  "killer": {
    "Moneypackage": {
      "RewardItems": {
        "Money": {
          "MaxValue": 10000,
          "MinValue": 100
        }
      }
    }
  }
}​

thank´s bb