open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I am a new user of telemac2d I want to simulate a straightforward Unsteady Simulation in 1D or 2D of a rectangular open channel.
My main issues are
1- Manuals or videos for performing the simulation (contains the steps of creating the needed files (I am not able to create the liquid boundary file and time_series file for prescribed Q and rating curve of prescribed H)
2- I want the subroutine file (the Fortran file) example of an unsteady rectangular channel.