MK3 TSRM On-Line
This is where you need to start.
This is the online toyota tech book.
Save it to your favorites.
While you're looking through it. Bare in mind that most of us here work on our own cars.
Mainly because between parts and Labor. It serves us well to turn our own wrenches. These are not beginner cars. You need to read all of the sticky's in this forum and get a feal for what is.... Supra.
Study a bit and get some well formed specific questions.
Because all that you have asked is asked here daily. If you look around you will see where someone has already answered this to some extent.
So feel free to browse. And post. Welcome.