Hello Zhina and Phelype,
I totally agree with Phelype, as a beginner his advises are excellent.
On other hand, Fudaa, as you indicated Zhina, is a tool that allows you to build up the steering (parameters) files. However, it is not necessary to use it. As a beginner, I advise you to use it, because you might not be familiarized to the Parameters of Telemac2d, Sisyphe, Tomawac, etc.
Thus, you will be able to generate your steering (parameters) file trough Fudaa. Once you are familiarized, you will not need to use it at all, you can change the steering file through the notepad or any other text editor, without problems.
Fudaa also works as a Post-processor, I do not have experience with it post-processing, but if you want to use it, it is possible.
I hope this mentioned above to be helpful.
Cheers,
José Andrés.