Hello, I don’t have the heatsink or fan yet, but each comes with required mounting hardware. In addition, the heatsink comes with thermal pad. The heatsink mounts to holes(4) on the VIM2’s PCB, the fan mounts to holes in the heatsink. On the VIM2, the fan connects to a fan header on the PCB, it can be controlled via the settings in Android. See here for mounting example.
You may be interested to know a new case is also coming soon.
The VIM’s recommended power supply is 2 amp or greater. See docs.Khadas.com for more info. Khadas also offers a supply for the VIMs.