There are a number of great, and even more bad software packages on
the market for CAD/CAM jewellery work. My suggestion is that you go
over to 3dcadjewelry.com and sign up for the forum there. There are
some very knowledgeable and generous people on that forum who can
answer questions about the pros and cons of different packages. You
will also find many videos by members showing their own software and
hardware work flows.
Most of the members are working jewellers who make a living using
CAD. A few days of wandering around that site will give you a good
starting point for your search.