It would also be a good idea to have an audio as well as a visual display so I don't have to be concentrated too much on my screen while I'm walking and coding.
I was thinking that the audio interface would be like a text adventure format. That way I can create a simpler display for it first, before having to work out how to do 3D graphics.
Like, I will give the option to type in the commands that you can also verbally say.