To start the installation, please run the IoT Core Dashboard and select “Install”. Then you just have to select your device type and the microSD card and hit the “Install” button. After doing this, a file called “Flash.ffu” will be downloaded automatically. This .ffu-file is similar to a .wim file but includes the content of a full disk with the Core system on it. The difference between a .wim-file and a .ffu-file is that a .ffu-file also includes complete disk partitions and not just files.
Now the tool will flash the image on your microSD card. After this has completed, you can hook up your board and start it.
The first boot will take about two minutes. Then you will see the Windows 10 IoT Core default application instead of a classic desktop shell.
This default application shows you some details about the device like the name, the IP address or how it is connected to the network. You can configure things like the language, bluetooth or network settings.
Please click here for a very detailed guide that shows you how to create a basic image, add an app to your image, add a file and a registry setting to an image, add networking and other provisioning package settings to an image, add a driver to an image, build a retail image, creating your own board support package, update your apps.