Fusion’s great, but they’re about to make life hard. If you just want to do some test cuts or simple stuff, I’d actually recommend Easel. Free, easy and works - just be sure to make whatever you set up go to 0,0 in Easel and that will be home in GC - it’ll make sense when you try it out. I usually move the sled to where the bottom left is and then Set Home keeping stuff in the middle as much as possible.
To be honest, I probably use Easel more than Fusion now I think about it. It has it’s annoyances, ut it sounds like you want to do some initial cuts and be impressed. Here, try this: Video: How to use Easel to generate G-Code for Maslow
Once you have, don’t forget to post it What I Made Today! 