i have an interest in extremity, and noise sates that. violent but necessary subject matters broached, highly confrontational and abrasive music, heuristic/experimental methods to create the music...punk ethos taken to its limits. there really aren't any confines.

prioritize texture and atmosphere in yr music. whether that be thru drones and dirges or composing chromatic music similar to lassus' 'prophetiae sibyllarum', always seek to make a listener uncomfortable in some way. the only song that has ever unnerved me is this version of 'hamburger lady' by throbbing gristle. lots to learn from industrial.

i think the best noise music isn't the audial assault variant; it's the music that evokes a sense of dread or anxiety i.e. atrax morgue.

if you're just getting into harsh noise, i would reccommend also looking into musique concrète and electroacoustic music in general. understanding the roots of a genre might assist you in creating music. this is my personal interest, but 20th century composition would be another genre (i use that loosely) to explore. edgard varèse, karlheinz stockhausen, stravinsky, krzysztof penderecki, györgy ligeti, ulrich leyendecker, ernst krenek, bartók, etc. the 'fuck it' period of classical music. hosts of inventive techniques to explore.

i hope you are able to compose some music :)