[1.16.4] Loot Table not dropping custom block

[NeX40]

Hello everyone, i'm extremely new to Java and minecraft modding, i've been following a tutorials steps to get into it but for some reason, when i mine the custom block, it won't drop anything unless i set it to drop an already existing minecraft block.
Also, for some reason my custom block doesn't have a texture when it's in my hand or is dropped, only when placed, i don't know if this has anything to do with the drop problem, here's my .json code: 

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "testmod:custom_block"
        }
      ]
    }
  ]
}

I don't know if i should look for the problem here or somewhere else.
And again, i'm really new to this so please don't bully me, i just couldn't find a solution anywhere.

[Draco18s]

2 hours ago, NeX40 said:

Also, for some reason my custom block doesn't have a texture when it's in my hand or is dropped, only when placed

you need to show more code to resolve this.

[NeX40]

Here are the other .json files for the block: 

//assets.testmod.models.block
	{
  "parent": "block/cube_all",
  "textures": {
    "all": "testmod:blocks/custom_block"
  }
}

//assets.testmod.models.item
{
  "parent": "testmod:block/custom_block"
}