Just be aware of how much ink and toner costs these days and factor that into your plans.
Of course writers can always head down to their local shipping company and order bound books or large qualities of printed materials if the need arises.
Writers also need something of extreme importance that is too often neglected: data backup. Modern computers practically demand that they back themselves up unless you turn that feature off. Unfortunately those backups are huge and non specific, all you really need to do is buy a flash drive (for small files) or a portable hard drive (for whole computer backups / movies / music) or, if you would prefer, obtain free or paid for space on a cloud service such as Amazon cloud or one of many others. All of these options allow you to save all of your information to an external point so that if your computer crashes you can access it without losing everything. Just be sure you actually follow through and update your information once in a while.
Cloud backups are the newest option and one of the best for writers as saving files to the cloud allows you to pull samples down and show them off as needed on any computer, or use cloud printing. Look into it.
Business cards. You can order large numbers of cheap business cards very easily, have them printed off, and sent to you—and you should. Include your name, the name of your company (John Smith Content creation… if it is just yourself) and the fact that you are a professional freelance writer. Also include directions to your webpage.