Roughly how many gallons a week do you expect to be processing, or are you making a general question about a career choice?
There are a few ways of doing it, each with different capital cost, running cost and quality of silver recovered. You can recover silver from bleach and fixer.
The first part of the course could be how to Google 'silver recovery fixer'. That will give you a lot of information. A general chemical engineering / extractive metallurgy related course would be OK - what level of education are you at / do you expect to be at?
Best,
Helen