Hi Dnj

It’s not quite as bad as it seems, pop over to Native Instruments and download the free Kontakt Players here and install it on your computer.
Pop over to ASIO4All and download the ASIO4all driver here and install it on your computer.
Connect the line output of your computer to the input of your keyboard
Connect the USB Midi cable from your keyboard to the computer
Run Kontakt 5 (It will be showing on the desktop) and follow the instructions to add the Yamaha for Midi In and ASIO4all for audio out. (You will only need to do it once)
Select Midi Out on your keyboard
Select a sound from the Kontakt 5 menu
You can now play any instrument loaded into Kontakt 5 with your right hand.
The more advanced stuff can come later

Bill