Hiiii, first of all you should make sure to stay away from movies you know contain all the stuff you cant/dont want to see! since i dont really know your boundaries, i will rec some movies that i think are must watches but also "tame" enough for you! but please, please check their synopsis and potential warnings before watching them, i dont want you to be uncomfortable!!

The Shining (1980) - Kubrick
Nosferatu (1922) - Murnau
Eyes without a face (1966) - Franju
Peeping Tom (1960) - Powell
Psycho (1960) - Hitchcock
The Fear Street trilogy
Black Christmas (1974) - Clark
Carrie (1976) - De Palma
Suspiria (1977) - Argento
Halloween (1978) - Carpenter
Perfect Blue (1997) - Kon
As above, so below (2014) - Dowdle

since i am who i am, i put some "old" movies in there but if thats not your thing (especially since you're new to movies) you can totally skip them! or you can check them out too jfksksks

i hope i gave you enough good recommendations anon and if not, please dont hesitate to ask me again!!!!! i love talking about movies