Need assistance in connecting Sierra Wireless 4G modem to internet

Hello Experts,

I am investigating options for setting up remote cameras at our work sites.  I have a system that we purchased from a provider a few years ago, and am trying to determine if this is something that can be done cost effectively in-house.  The one part I am looking for advice on is using a 4G wireless modem and how to get it connected to a given carrier (Verizon Wireless, for example).  I have a Sierra Wireless RV50 in hand.  I am new to this process so would need to start from the beginning.  I am guessing that I would first need to contact Verizon and create a new line \ account, and get the required SIM card for that line?  If that is the case, then once I have the activated SIM card, I presume there is additional setup required on the modem?  I've reset the modem and have access to its management interface.  Additionally, once the modem is connected, and I've set up an "internal" LAN on the modem and addressed the camera(s) for connectivity, I am guessing I could use DDNS to reach the cameras remotely?  I've been told that VZW charges $500 for a static IP.  I would want to avoid that if possible.  Any \ all info on how to get the wireless modem connected and available on the internet is greatly appreciated!!

Thanks in advance,

Russ