You would probably want to start with an automotive program from a local college or tech school. From there, you could probably work at a local shop or hang around during tuning sessions and pick the tuner's brains. There isn't really a "performance tuning class" or anything that I'm aware of. It's something you work and research and attain the skill set on your own.
Where do I submit my application and FAFSA? I hope they offer subsidized Stafford loans...for tuition of course...definitely not to dump into the car...