Civ does not have an RTS element. Anyway, Blackjack, a board game is not an easy programming task. I’ve never seen a tutorial that walks you through how to create a board game, but any tutorial would likely be fairly advanced. As such, I wouldn’t put your hopes on building a board game as your first Unity Project. Do something simpler, follow the Tornado Twins and Unity tutorials. As you gain an understanding of Unity and programming in general, understanding how to build a board game will come to you naturally.