Probably the easiest way is to place a classified selling everything as a lot or to find a truck or a trailer, then bring it all to a scrap yard such as Sal's
Scrap Metal or Sims Metal in Hunts Point / Bronx. The magnetic stuff is steel / shred, they will weigh it at your arrival and ask you to dump it somewhere in the yard. After that, you return to the scale to calculate the weight difference. After that, bring everything else to smaller scale. That's where you'll get better prices for aluminum, copper, electric motors/wires and ask them (or another customer there) if they can help you to sort stuff since you are not familiar with that domain.
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