someone help me to mod my idea

my idea is: I want to script a mob like. when he spawns in the night and there's a script called anonymous_monster_biome_modifier.json edit it. and he makes a sound. it called sound1.ogg and sound2.ogg and sound3.ogg. he only make one of these sounds when he appears and stalks player far away like 64 block or more. he spawn in the night only. the biomes is plains and jungle and swamp only. When player approaches him. he his skin changes. and name the texture like. redeyes.png . then he disappear. and when this loops 3 time at the player. when the player approaches to him. he make a screen jumpscare with screaming when  the sound ends he attacks. the sound effect called scream.ogg. then disappear. when this loops 2 times. when player approaches to him. he start to attack with netherite sword and he don't drop it when he dies. only 1 mob can spawn. the mob name is Anonymous Monster. he extends biped. try to make a texture of him and when player approaches him his eyes becomes red. and try to find scary sounds for sound1.ogg and sound2.ogg and sound3.ogg