replace rusted rear brake line (left side) and bleed brakes on 1996 Chevrolet Cavalier

My rear left side brake line is rusted and needs to be replaced. Then I will need to have my brakes bled, after replacing fluid.

Asked by for the 1996 Chevrolet Cavalier
What's the question?
my brake pedal goes almost to floor ,put brake fluid in does not pump up ,i see fluid on back right tire ,how do i check brake lines leaks and fix