Below you can find different pictures, videos and texts about the proposed options above...
How a wireless keyboard looks like
Connect the Bluetooth USB receptor in the laptop/PC and start using the wireless keyboard with trackball to be used as mouse
Beside you can find examples of this type of hardware, but better you make your own research to find what you prefer...
App to use Smartphone as keyboard/mouse
Find the App in the required App store, download, install and configure the laptop...
Beside you can find a video as example. You can make your own research to find wich App you prefer.
How to configure and manage Chromecast from your Laptop/PC
Beside you can find a video showing how to configure Chromecast and then how to use it allowing you to watch on your TV set video contents.
How to configure and manage Chromecast from your tablet or smartphone
Beside you can find a video showing how to configure Chromecast and then how to used allowing you to watch on your TV set video contents.