Any surgestion on this would be nice

trouble with storage you won't likely have forklift or dock there
Getting them broke down fast and the cases( power supplies too) to scrapyard will remove a lot of clutter. If your yard isn't familiar with power supplies open one up and discuss it with them, they should be able to classify them with motors, or at least better than shred
Being able to know if a computer is either too vintage/new to scrap takes experience, probably best put your most experienced worker at the sort position
Many will wish they had your problem(not me, but i'd like half your problem ; )
Good luck!