The special Raspberry Pi version of Windows 10 is a cool way to create Internet of Things devices, but it's a little baffling to use if you're a beginner. Adafruit created a starter pack that also happens to include a bunch of free, public guides to learning how to do everything.
Adafruit's Starter Pack ($US114.95) seems like it comes with everything you'll need to get started if you don't already have a Raspberry Pi (though it's currently out of stock). However, if you do already own that stuff, you can still make use of their starter guides to get to know the operating system. From setting up your PC to a few simple projects, this collection of guides should be enough to get you going on your own projects.