I think scribes are one of the best professions in the game. My first character on any shard is always a scribe. That said, you'll want you magery as high as can be. The higher the magery, the greater chance you will get additional mods on your spellbooks (and scrappers).
Also, don't forget you'll need a recipe scroll for the Scrapper's Compendium (which are rare drops from several Heartwood quests). And the ingredients to make it include a mane from Dread Horn. He's not easy, so you'll need a means to get that (and some other ingredients) before you can start making Scrapper's Compendiums.
-OBSIDIAN-