How do I
1e You can use the command sweep.
starting on 2 Sketches. running over the path from beginning till the end.
To get the 3 dimensional curves you can use excel to get it easy in shape including bending afterwards.
2e using the command Sweep.
drawing several planes with sketches for the routing.
There are several tutorials to explain these kinds of structures.
1 ore 2 depends on the details you want to show.
Torsion is with 2e method easier.
Give it a try, come back with the points of problems.
It isn't a hard job.
Best Regards Tommy