Creating a WWAN profile in NMCLI, or alternate way of connecting to 3G via CLI?

I need to connect to the internet via a TP-Link MA260. After spending hours with usb_modeswitch and other tools, I finally got the device to be recognised as a modem and have the interface wwan0.

I've tried various commands and configs with wvdial, but, I just can't seem to get it to connect.

After reading up many guides, I heard about Network Manager's CLI, so, I installed network manager on to Ubuntu Server.

When I perform nmcli nm it shows

RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
running         connected       enabled         enabled    enabled         disabled

I then spent so long looking around the internet, and I stumbled upon this question: How to enable/disable mobile broadband from terminal?, which got me a little further, however, all answers refer to nmcli -t con up id "bla".

No matter what I try, I can't work out how to create "bla", or how I should define the 3G settings, and even when I do find it, I'm not sure what to write.

I found a guide that says that I have to type nmcli con xx, but, edit or add don't seem like valid options and I am stuck.

Can anyone tell me what I need to do to connect?