I am 24 years old and about to finish my four year business degree.
A major distraction is I make my living with CamBam, Meshcam, Blender, and Linuxcnc...
It's paid for my college and a few trips internationally--kept my bills down, etc. I am going to try growing it once I graduate, however, I feel it's wise to learn something like Autocad since employers usually want that on a resume...
I like working with my hands, understand how stuff works, design stuff, fiddle, figure it out, make it faster, etc.
Not an office job or managing people.

Thus far over 4-5 years I understand the entire toolchain for CNC, however, nothing mainstream or commercialized.
I have ample student discounts for software--which CAD package should I choose to learn?
Should I got the Autocad and the eventual Mastercam route? Is there a better more future proof idea?
I'm not hunting for a job, but I want to do some design and random prototypes for fun--so I'd like to do so using a modern and capable package.