Got to start somewhere, so Mig would be what you're after. Easy to use,
Do your TAFE course, But there is a bit more than just welding 2 bits together.
Tri-angles are great as you cant bend them, but all this will come will experience.
Gets your mates to critic your work, you'll soon be doing clean presentable work.
Avoid any work that may need certification, leave that to the experts, ATS.
Look forward to seeing some work......