To copy, first insert a floppy disk (or some other removable drive). Make sure you know its drive letter (I recommend a floppy because its always A:). Type at the command prompt (I assume your documents are on C:\): copy C:\*.doc A: (replace A: with the drive letter of the removable disk)
That will copy the DOC files to the drive. If your documents are big, you may need more than one floppy (assuming you use a floppy). Now you can put your floppy (or other removable disk) into another computer and copy your documents over.