process of selling a game

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So Me and my brother are almost done with a small game and we are a small company of 2 as you can see I was wondering once we are done what is the process of selling the game I understand you can sell the game with a free version of unity but how do you track that we reach up to $100,000 in revenue do we have to pay unity anything to sell our games what are all the steps to selling this game with the unity free version your help would be wonderful Thank you for your time