Deciding what I need in my office

One of the hardest things to decide on my new office, is what do I need to have in the office. I'm going over all sorts of things that I might need for my writing work and what I can do without. I know I need a card file, and I also need some dry erase boards. I want bulletin boards. I have to have a place for maps. Must have book shelves. Need a printer area where I can put the printer, spare ink cartridges, and paper. Need a mailing center area for envelopes of all sizes and manuscript boxes. The trick is in sorting out where each element will go so I have the office looking good rather than over-cluttered and a mess.