I would like to create a page for this release: Messiaen: Turangalîla-symphonie
How should I start? What would be a good tutorial or how-to for me?
you would start by clicking “editing”
or - since the artist is already in the database, maybe go to his entry and add it from there
the standard “how to” documentation is a good place to start.
Since this is a classical release, I’d suggest taking a look at
in addition to the standard https://musicbrainz.org/doc/How%20to%20Add%20a%20Release and https://musicbrainz.org/doc/How_to_Use_the_Relationship_Editor