Hi, I purchased two of these S2721NX for my kids for Christmas but I am not totally sure how to set them up. 

Here are my questions:

1.  I know that they do not have integrated speakers, but there is a headphone jack, so I assume that there is an audio signal, just no speakers to play it through. That said, can I plug in free-standing speakers through the headphone jack to get the signal to play through the speakers?

2.  There are two HDMI inputs and 2 HDMI outputs on this S2721NX. Am I correct in running an output from the Chromebook to the monitor input? For a clip-on webcam (Logitech C920S HD), do I need to run that as an input from the S2721NX to the webcam OR do I need the webcam to run as an output from the Chromebook to the webcam input? 

3.  Finally, should I get a USB expansion hub to set all of this up or is it not necessary? I am trying to make it as easy as possible and with minimal cables, but if a hub will make that easier, I am not against it.  If yes, what is the minimum electrical requirement?  

Thanks in advance for any help you can provide!  I am not entirely computer challenged, but when it comes to a setup like this, I'm a mom who could use some help!