Fusion 360 - Phil Johnson is more adept with this one than me.
I tend to use a combination of tools.
Zbrush and Maya mainly but its what ever you have or are willing to learn.
I also use UGS (Universal Gcode Sender) to send the Vcarve gcode to the machine.
You can evaluate them and see what works best. It will take some time on the learning as you will not get good overnight.
Those of us here can also help you get there quickly if you are willing to share the project files.
Other than that the system you rebuild should be calibrated.