@ Dikrud2505
Welcome aboard mate
point #1 & #2: sorry to ask that, but do you have the Steam version of the game?
point #3: I go by memory here, but all the times I installed the game, I never had to install any DirectX version manually; it is my understanding that the game installer checks automatically if all the required drivers are on your computer, and installs them if they are not. Only the Ubi patch 1.2 needs to be installed manually at times, as the game might fail updating itself automatically. After installing the vanilla game, run the game and check if the gane version number (top right corner of the main menu) reads 1.2.0. If it does, and the game runs correctly, you are ready to install this supermod. As far as I know, TWoS doesn't require any DirectX version different from stock game.