Open a document so a read-only user can make changes in Word

You can create a new content type for each word doc (faxes etc....) and create a separate doc library for each type. Fax library, other library etc... Then, you can have the user create a new doc every time they want actual info in it by adding a new doc in the library. Now you can give them write access to each new doc they create/add and they can add things to that doc without changing the content type template. In other words, when the next user comes by, instead of editing an existing doc in the library and thereby leaving their changes behind on the doc, they would create a new one where the info is blank according to the content type template and they can enter whatever they want. The downside is that users would have to create a new fax doc every time they want to print a fax (takes 2 seconds). also, you will have copies of all of the fax sheets created, each with different data, but that might not be a bad thing as now you have a history of fax sheets that supposedly went out. You can also create a view that does not show any of the existing docs in the library, thereby clueing the user that he needs to create a new one rather than editing an existing one  .