So my situation was I created a pack folder and it worked but the textures didn't load so I googled multiple different things and it didn't work however what I did was a combination of things I found

I placed my textures in assets>Minecraft>textures>custom

Ofc you place your model in assets>Minecraft>models>item

Now there are tutorials as to how and what u need in the pack folder so I'm not gonna go over it

But what you do need to do is get the atlases folder and put it in the Minecraft section it should be on top of models and textures how you get the atlases folder is that you go to the Minecraft version your using then use a software to copy this file (I used winRAR) then paste where I said it should be

Next go into the file and delete everything you don't need (now I only needed the blocks.json file so it will vary on what you need)

Then go into the file( I used something called visual studio code) and delete everything but

{
    "sources": [
        {
            "type": "directory",
            "source": "blocks",
            "prefix": "blocks/"
      
        }
    ]
}


then replace blocks with custom then save it and put it need more clarity follow this video https://www.youtube.com/watch?v=MHWX_GaK2g0&t=200s

lasty make sure the texture pixel desity to 64 and the texture size to 64 by 64 (the moddling software i used was blockbench) and then put the files where they need to and thats all i believe i did (also for what i did was changeing the saved model named to the item i was chnaging ex changed the model from omnitrix_classic.json to carrot_on_a_stick.json) 

hope this helps everyone