I bought time ago this package in Steam and I wonder witch one should I play first? Collection or Fallen champions? 
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I am new to the game that’s exactly what I want to know but this place seems to be graveyard
but this place seems to be graveyard 
King Arthur Collection includes the King Arthur base game and its dlc, including two expansions with new campaigns (Saxons and Druids). King Arthur: Fallen Champions is the standalone expansion that takes place after King Arthur and before King Arthur 2. so play King Arthur -> Fallen Champions -> King Arthur 2 if you want to play them all in order. The Saxon and Druids expansions let you play two different factions during the King Arthur 1 campaign.