For other pre-gen adventures, I think that Tales of Mythic Europe (ToME) might be helpful. I suggest this because I have no idea of the kind of adventure you have to run, and there are some nice adventures for everybody's taste there. Some of them are long, though (I would suggest not running Rise and Fall).
One that springs to mind (2 actually) are the first adventure (the regio one) and the adventure about mundane inheritance. I think those might fit your expectations.
More details on what you want to run based on your saga might help
About the characters: I would simply head straight for the saga subforums and steal a few characters from there. There are dozens of magi, grogs and companions in those forums.
I think the Nigra Saxa mini-saga download from 4th ed. is a very easy one-shot to run, and a great starting adventure. Local Baron's daughter goes missing... follow the clues into the faerie forest to get her back. It's got everything to introduce you to the setting: Mundanes afraid of magic, Interaction with nobility and the fae, a Little bit of combat, and a nice, fun little mystery. It was the story that got me into the game, and I've since run it as well.