Hi. I'm new to all of this, so I am asking at least twenty questions today.
I'm curious if Adobe After Effects is used independantly of Premier or if it can be used as a plug in?
Also, just wondering what Magic Lantern is. I believe this is something that can be added to a camera's firmware? Is this worth doing, or can the software be used outside the camera?
After Effects (AE) is a completely separate program - it's part of Creative Suite / Creative Cloud but can also be purchased individually. It does not run as a plugin to Premiere Pro, but you can 'send' a Premiere Pro sequence to AE for editing.
Magic Lantern is a firmware hack for Canon DSLR cameras (EOS series). It allows access to features not found in the standard firmware.