This article describes how to setup Visual Studio 2015 for Windows 10 IoT application development.
Before installing VS2015, make sure you are running the public release of Windows 10 (version 10.0.10240 or later). You can find your current build number by clicking the start button, typing "winver", and pressing enter.
Install Visual Studio Community 2015. Select the checkbox "Universal Windows App Development Tools -> Tools and Windows SDK" when installing.
If you already have Visual Studio 2015 installed, install Update 1 from the Extensions and Updates dialog in Visual Studio or from here.
Selecting "Help > About Microsoft Visual Studio" will display version information. The required version of Visual Studio is 14.0.24720.00 Update 1 (or later). The required version of Visual Studio Tools for Universal Windows Apps is 14.0.24720.00 (or later).
You can follow the "Windows 10 Desktops/tablets" section from these instructions.