I am a non-reading composer who has stuck with him for so long that now I have a good pen. I compose quite a lot with a computer.
You can get a simple MIDI sequencer or a really good one, similar to the one in Propellorhead Reason (a great compilation tool), experiment on your own or download free MIDI files from Bach and other classical composers, then you can see where the notes are on the keyboard in MIDI- sequencer. In addition, you can move them to see what happens.
A really good website for familiarizing yourself with changes in voice and chords (progressions),
http://www.musicnovatory.com/
This is not a very intuitive navigation site. But you can teach them a lot to help with good sound changes by choosing voices and choosing chords. Be patient and be very curious, that is, there is a lot of space on the site and you will find gems.
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James Schlesselman