Probably a very straight forward query where someone can point me to a resource.....

In outlook (mail sent as html) we want to create flyers for different offices.
I have the html pages sorted with different addresses/details et cetera but I noticed in one document a reference to how to create new mail with fill in fields - much like word forms - but in html format.
The text book referred to a standard stationery item of "Party Invitation" and went through details of filling in dates and names et cetera.

That would be good if I could use same functionality on the flyers and allow users to add up to date details in midst of preset text.
Is it along the lines of using a text field or some such?
Any suggestions?