When sizing the text to fit your engraving here are a few things to take note of:
Standard Door and Desk Engravings of 2x10-2x12" sizes used for name and title usually use a layout that has the first line at 1/2" and the second line at 1/4". This translates to a capital letter size of 48 point and 24 point respectivly.
Name badges in the 1x3 size range generally use 24 point first lines and 14 point secondlines.
Some engraving sizes have several lines defined. If you only need one or two lines for your engraving, use the first and second text input area. You can preview your engraving as many times as you wish if you change fonts, font sizes or backgrounds until you are satisfied with your design.