vanilla spider AI

Good day folks. I recently started using Mcreator to create my little mod. I want to create a new type of spider that would spawn in desert biomes, using the vanilla AI of the spider in minecraft and a slightly more contrasting texture of the spider from the classic version minecraft(brown texture). However, I don't know how to write procedures. For example, so that a spider makes several sounds when steps(like a vanilla one). Is it possible to download the ready-made procedure code somewhere?