Very new: will I be able to communicate with this controller board?

So, questions for the OP:

1) Is there actually a parallel port on the control box?
2) Is there a USB to DB25 cable as part of the kit, with a slightly fat connector at the DB25 end?
3) If you pull the top off the controller, do individual wires run from the DB25 to 3 x identical stepper drives, or does there seem to be an intermediate layer?

There is a fair chance you can ditch the USB-parallel and use either an actual parallel port on a PC (as old-fashioned as that might seem) or use one of the PCI or ethernet-connected Mesa cards with a DB25 output.

But whatever choice you make, it you are using LinuxCNC then the USB cable can't be used.

The good news is that if you are a Python programmer then it is easy to send G-code commands direct to LinuxCNC from Python
linuxcnc.org/docs/2.7/html/config/python-interface.html