Welcome to the forum Hank.
The best advice that I would have liked was to understand the workflow: design (CAD) to Manufacturing gcode (CAM) to cutting metal (FireControl). You need all three of these pieces of software to really be successful.
Here is a good link to understand that workflow:Software Workflow | Langmuir Systems
Keep in mind that design can come from all sorts of software, basically anything that can create a DXF or SVG file. Manufacturing or making the g-code is limited to two sources: SheetCAM or Fusion 360. Cutting at the table is limited to one source: FireControl.
As for Fusion 360, it is the only software that will do both the design and manufacturing in a one stop package but it is overwhelming at first.
This is a good link to get a quick idea of Fusion 360 but most of them are with older software so the interface has changed. Listen to the words they are saying as those same words continue to be used and are the important things to grasp.
https://www.langmuirsystems.com/software/fusion
Once you get the table set up, try to limit your urge to create a “masterpiece” before you get your table dialed in. You should make sure that the torch is cutting at the correct height, using the right consumables (OEM designed specifically for your model - based on your cutter I would say buy from Langmuir or George @mechanic416 for right now) and using the settings that limit bevel and dross.
Know that “cut ready” files may not work on your system so it could be a red herring.
Lots of good people here to help you along the way.