Question

what all errands did Nicola and jacopo run for their living

Answer 1

they polish other's people shoe at public square.
they sell wild strawberries.
they wait for the last bus from Padua to sell their remaining newspapers.
they both help the tourists by guiding them

Answer 2

Nicola and Jacopo were doing various odd jobs like selling fruits, shoeshine ,as a tourist guide, bring pack of american cigarettes hawked newspapers, conducted tourists round the Town and ran errands.
hope it helps you