Well it is awful he needs to sell his stuff but I hope he can at least still ride.
I've been through this twice, once because I need the money after the government deprived me of my livelihood after.... well lets not get into that. And the other to downsize and raise money to move. If you not doing to raise cash to pay the rent it isn't as frustrating as selling to downsize. It does however take a lot of time and effort to scann ebay and craigslist and see what people are asking for stuff (Some of which isn't sold often like a RIGI) and ebay for completed listings.
For parts it was simple enough I started with NOS stuff that I was likely to never use and them moved to odd bits like a blue Galli cranksent that would likely never get used because it was only 170. Bikes were last in or least used first out.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk