For a while, I have wanted to make some kind of Custom Item Texture pack or resourcepack.
My computer can't run mods, and I have collected around 50 different resourcepacks on a google document to create the most non-vanilla experience entirely in vanilla Minecraft.

I want to make custom textures with the CIT pack (like itembound) but I also want to make models. Maybe something small. I downloaded Blockbench but I don't know how to add the models into Minecraft. If you've made a CIT pack before, whether with textures or models, where do I start?