Here are some desk ideas on houzz.com

Just go to the houzz shop they have many options!

Here is some office chair ideas on houzz.com

Lucky you! Go vertical! That will get all of that stuff up off the floor. Find a system that runs along your wall, and which gives you the filing, surface area and storage that you need for your particular office. Once you have freed up floor space, you can add seating or perhaps even a sleeper sofa for overflow guests. Tuck your office things away, et voila! A guest room.

Here are some ideas for storage on houzz.com

Here are some useful chalkboard uses on houzz.com

Yes I agree with sooz001 that you could even have a day bed for guests!

Here is some ideas for a day bed on houzz.com