The tools needed for postcard collecting can be as few as none or as many as there are. A few items which seem useful to me as I work at postcard collecting include the following:

file cabinets
storage boxes
file dividers, tabs
sleeve assortment
magnifiers
clear display pages
price stickers
page protectors
eraser assortment
binders
dictionaries
world maps, atlas
gazetteer
encyclopedia, on CD
scissors
address labels
cotton balls, Q tips
blank discs
disc storage case
display boards
clear photo corners
calculator
legal size envelopes
postage stamps
pencil assortment
assorted colored felt tip markers
book shelf for albums and file boxes