It is a vast field. Forming sheet metal on an english wheel is a specialty in itself.
Having some sense of what you want to make might be a good start, to help focus. otherwise, start looking around on youtube and reading, and find someone who has a shop who is willing to teach.
Two places I go a lot are the welding web and practical machinist forums, there are a bunch of other metalworking forums also, each may have a "specialty", but lots of overlap. Just reading and looking at pictures will teach a lot, and may help direct what you want to do.
Somebody mentioned you were on a ship? Navy? Ships have machine shops- is there an opportunity there? I have no idea on that sort of hierarchy.