Select the mesh and armature object types, forward direction of -Z, up direction of Y, and click the apply transform button, then click export. To export an object from Blender and import it into Unity, Go to File>Export>FBX and make sure you set the correct parameters. Once the asset has been created in Blender the artist will need to test the asset in the game engine of your choice. One of the main reasons why someone would begin learning about 3D modeling with Blender in the first place is to create 3D assets for use in video game engines.
