So, as a way to get technology going, I am using a LibGuide to guide us through the entire interaction, so students can easily follow along. I've set it up here: Library 101 (ignore the fact that the tour is not actually a tour of our library).
My hope is that with this LibGuide searching as the students' "worksheet," they will be able to click around and follow along as we talk about library use.
In the past, the thought of giving students a computer has been avoided simply for the distraction it can cause. ("Wait, we weren't supposed to be browsing Pinterest and Facebook during class?") The good news, though, is that in the learning lab I'll be using, all the computers are connected to a central system. And I can choose to show any computer on the main screen at any time, without the user's permission. So, I can make it very clear at the beginning of class that if you are browsing a site you shouldn't be, you should be prepared for the entire class to know when I launch it on the main screen.
Additionally, the room setup allows me to watch what students are doing more easily. See my terrible MS Paint diagram below: