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I have made up a couple sets of trany lines, they aren't to hard but you would need a bender or something that will make the 90 degree bend that goes into the tranny without kinking the line. The other bends are not that sharp and can be done with your hands. You would also need a double flare tool, some auto part stores rent them to you for free. Making a double flare can be tricky so practice on a couple short pieces. You could buy new flare nuts or reuse the one on the old lines, it depends on how badly rotted they are. Be sure to secure the lines so they don't rub on anything.
Go to any automotive parts store and purchase steel brake line.
Get the kind with a steel coil on the exterior.
It can be bent very easily and will not kink due to the coil supporting it.
The coil also helps prevent rub through if the line comes into contact with another metal component.