The iPad does not support a mouse, and while it can connect to external displays, I'm not sure I'd consider using it in regular fashion connected to another display except for presentations and such. It will support an external keyboard, but the iPad 2 uses Bluetooth keyboards so no dock would be necessary.
The iPad isn't a standard laptop computer so don't think of it in those terms. Tablet systems like the iPad are an entirely new breed of device and have much different methods of operation. If you need to think in terms of an analogy, its more useful to think of an iPad as a very large iPhone without the phone capabilities than it is to think of the iPad as a laptop computer, though I think that sells the iPad a bit short.
If you have an Apple Store near you, or have a corporate Apple account executive, I'd strongly suggest you try and get your hands on an iPad and work with it for at least a short time. That would be very helpful, I think, in helping you figure out how your staff would best use such a device. You might well want to consider purchasing one so you can spend time with it, or (if you're working for the furniture company) getting on one loan from your Apple account rep; I'd suspect they could provide one for a company your size.
Regards.