Hey Lindsey, I've taught loads of beginners over the years so these things could work for him
-String names (You can use Elephants, And, Donkeys, Grow, Big, Ears (EADGBE) to help him remember the string letters) I usually then play a game where I mix up the letters and get the student to find the strings that I say, getting gradually quicker as we go.
- The Spider exercise - Shows him how to use all 4 fingers straight away by matching them to each fret and playing in order - 1234 on every string (This will usually highlight how Important thumb position is if they struggle to reach up to the low E string and it'll allow you to explain that)
- The very start of Metalica's Nothing Else Matters can be cool as a fun way to practice hitting the right strings with his right hand (Low E, G, B, High E, B, G etc)
- The Smoke on The Water Riff (super easy and gets across the idea of using open strings & fretted notes
- The riff from The Man who Sold the world is good for an easy Hammer on/Pull of exercise too
- If he takes to all of the above really quickly then Wild Thing by The Troggs is a great tune to introduce chords: It uses A, D, E & then lifts the A off and on for the breaks, it introduces counting and keeping time in those parts too.
- For the Pentatonics, I usually show Shape 1 and then ask what the student has been listening to recently, stick the tune on Youtube and find the Key that works with that Shape, then you get to explain how you can jam in any key by just moving that Shape to the right fret. That can get him getting a feel for the shape while feeling like he's contributing to a song he loves
If he really takes to it, you can challenge him to pick 2 neighbouring strings and try and come up with a simple repeating lick that goes with the song
For those who have never played before, it's useful to give them something that they can make sound like a tune as quickly a possible, to give them that confidence boost & to make them feel like they want to put the work in to keep playing
Easy riffs are essential as for many, playing Chords won't be manageable with their first sitting and can put people off if they're not ready to try them.
Hopefully this helps!