You can get the download link for the setup file in here : https://www.visualstudio.com [Scroll to the bottom of the page and download the Visual Studio]
The setups are relatively simply and common. But do take note when they ask you to download the default or custom, you can choose to download the custom and pick whichever programming language you want to download alongside with it too! [Default mainly comes with C#/VB]
For android/Cross-OS development, you can take Xamarin, it is supported by Visual Studio and vice versa.
When you startup Visual Studio, you can go to the top bar, tools>options and configure how your IDE looks, shortcut keys etc. (Refer to picture below)
And that its , you can basically go to the top bar, files>new to create a new project and start your work!