you will need these no matter what.
Computer
Interface
Software
Microphone(s)
Instrument
You don't need a computer, interface, and software no matter what. He could go analog. But he does need monitors no matter what and I don't see them on that list.
You need:
Something to make sound including one or more of:
*Instruments+mic+preamp
*synth+DI
*VST Synth
One of the following to capture sound:
*DAW
*Stand-alone recorder (Roland 2480, etc)
*Tape recorder (Tascam cassette, reel-to-reel, etc)
*ADAT
Something to hear sound:
*Powered monitors
*Passive monitors + amp
*Subwoofer
*room treatment
One of the following to mix sound:
*Analog mixing board + outboard effects
*DAW + mouse
*DAW + outboard control interface
To begin, I recommend as a minimum:
*Free download of Reaper + free plugins
*Nice set of powered monitors
*Single mic of your choice
*cord to adapt that mic to plug into your pc's sound card
*a day moving furniture to get the room sounding the best it can
If recording turns out to be your thing, then look into a subwoofer, more/better mics, a real recording interface, more cords, more room treatment, etc.
If recording turns out to not be your thing, the mic was probably cheap and you have a good set of speakers now for your TV/Xbox/bedroom stereo/whatever.