I know how to register blocks themselves, but I can't understand how to register blocks+items which reperesent them. Can somebody help me?

You create a new block and register it:
 

//Register<Block> event

//somewhere in your code 
final Block[] blocks = {
                new BlockBasic(Material.ROCK, "first_block", "my_first_block")
};

event.getRegistry().registerAll(blocks);

Then you register the items with the reference of the previously mentioned block above (in my case they are stored in TutorialBlocks)
 

 final Item[] itemBlocks = {
                new ItemBlock(TutorialBlocks.MY_FIRST_BLOCK).setRegistryName(TutorialBlocks.MY_FIRST_BLOCK.getRegistryName())
};
//this is the event where you would register your items normally
event.getRegistry().registerAll(itemBlocks);

Then you register the model as you would do with an item
 

registerModel(Item.getItemFromBlock(TutorialBlocks.MY_FIRST_BLOCK));

 private static void registerModel(Item item) {
        ModelLoader.setCustomModelResourceLocation(item, 0, new ModelResourceLocation(item.getRegistryName(), "inventory"));
    }

If you need the .jsons as well tag me.

Edited January 2, 20196 yr by Eiachh

Thank you very much.