What is inscription anyways? I mean, we all know that it's the newest profession, added in Wrath of the Lich King, and it lets you make these "glyphs" which allow you to modify or improve your various class abilities in interesting ways. In gaming terms all that makes perfect sense, but when it comes to telling a story with your character, there are a lot of details missing.
Technically, a glyph is a character or symbol, like a heiroglyph or a pictograph, which we can see to a certain extent when we click on the glyph and put it into our in-game glyph interface -- it looks pretty cool with all those circles and lines and stuff. But what does it really mean? Are you pasting these symbols into a book of some sort? Are they getting magically tattooed onto your skin somewhere?
And where did inscription come from to begin with? Has it been around in Azeroth all along somehow, or was it some sort of ancient knowledge only discovered recently, around the time in the Warcraft lore when the Wrath of the Lich King begins? If it was discovered, then who discovered it and how? How exactly does a scribe learn these glyphs? Does he or she pore over ancient tomes that haven't been read in thousands of years, trying to decipher ancient texts? Or is the art and magic of it more in the artistic calligraphy of it rather than any difficulty in discovering or interpreting the symbols themselves?
There are far more questions than answers when it comes to roleplaying a scribe, and to a large extent each roleplayer is free to choose his or her own approach. What follows is the just one suggestion as to how you might work out a plausible solution -- please feel free to read it and improve upon it in whatever way you like.