Or you could just sign up for the next
Introduction to Music Production course at Coursera. They repeat the courses every few months.
Other good courses there of interest to musicians:
Fundamentals of Music Theory
Developing Your Musicianship
Songwriting
Introduction to Digital Sound Design
Survey of Music Technology
Introduction to Ableton Live
You learn by watching videos on your own (or with others if you want) and do the coursework, which differs with each course. For example, in the Music Production course you create tutorials (video, PDF, document) detailing how to use various plugins; in the Ableton Live course you work on and submit an original piece of music made with Live. You can also (and I recommend it) take part in the forum discussions, and that's often where you learn more than the professor is teaching.
Oh, did I mention that they're free if you don't need or want a certificate?