An easy way to learn about TOS is to start in our useful sticky at post #1, it is full of crash course info links. It will cover so much more than we can remember & type out..
http://neurotalk.psychcentral.com/thread84.html

expert PT, bodyworker or chiro can help with much of the posture issues and scoliosis.
There are youtube videos showing scoliosis manual therapy, it will give you an idea of what to expect.