In order to view and edit Word documents (.doc) on a handheld PDA, you will need a device running Windows Mobile with Office Mobile installed. Here is Microsoft's list of PDAs that feature Office Mobile and a QWERTY keyboard layout:
http://www.microsoft.com/windowsmobile/en-us/devices/smartphones.mspx?f_office=Yes&f_qwertyKb=QWERTY
Using Word documents is strongly discouraged. Word, as a Microsoft proprietary format, is often not compatible with 3rd party software and systems. In addition, Word documents are very insecure, and are therefore not suitable for sensitive information. Visit this location for more information:
http://en.nothingisreal.com/wiki/Please_don%27t_send_me_Microsoft_Word_documents