Registry Handler

package com.ButterAleks.RandomIdeas.util.handlers;


import com.ButterAleks.RandomIdeas.init.ModBlocks;
import com.ButterAleks.RandomIdeas.init.ModEntitys;
import com.ButterAleks.RandomIdeas.init.ModItems;
import com.ButterAleks.RandomIdeas.util.IHasModel;

import net.minecraft.block.Block;
import net.minecraft.item.Item;
import net.minecraftforge.client.event.ModelRegistryEvent;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.fml.common.Mod.EventBusSubscriber;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

@EventBusSubscriber
public class RegistryHandler
{
	@SubscribeEvent
	public static void onItemRegister(RegistryEvent.Register<Item> event)
	{
		event.getRegistry().registerAll(ModItems.ITEMS.toArray(new Item[0]));
	}

	@SubscribeEvent
	public static void onBlockRegister(RegistryEvent.Register<Block> event)
	{
		event.getRegistry().registerAll(ModBlocks.BLOCKS.toArray(new Block[0]));
	}

	@SubscribeEvent
	public static void onModelRegister(ModelRegistryEvent event)
	{
		for(Item item : ModItems.ITEMS)
		{
			if(item instanceof IHasModel)
			{
				((IHasModel)item).registerModels();
			}
		}

		for(Block block : ModBlocks.BLOCKS)
		{
			if(block instanceof IHasModel)
			{
				((IHasModel)block).registerModels();
			}
		}
	}
	public static void preInitRegistries()
	{
		ModEntitys.registerEntities();
		RenderHandler.registerEntityRenders();
	}
}

Render Handler

package com.ButterAleks.RandomIdeas.util.handlers;

import com.ButterAleks.RandomIdeas.entity.EntityTestEntity;
import com.ButterAleks.RandomIdeas.entity.render.RenderTestEntity;

import net.minecraft.client.renderer.entity.Render;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraftforge.fml.client.registry.IRenderFactory;
import net.minecraftforge.fml.client.registry.RenderingRegistry;

public class RenderHandler
{
	public static void registerEntityRenders()
	{
		RenderingRegistry.registerEntityRenderingHandler(EntityTestEntity.class, new IRenderFactory<EntityTestEntity>()
		{
			public Render<? super EntityTestEntity> createRenderFor(RenderManager manager)
			{
			return new RenderTestEntity(manager);
			}
		});
	}
}

Reference

package com.ButterAleks.RandomIdeas.util;

public class Reference
{
public static final String MOD_ID = "ri";
public static final String NAME = "Random Ideas";
public static final String VERSION = "1.0";
public static final String ACCEPTED_VERSION = "[1.12.2]";
public static final String CLIENT_PROXY_CLASS = "com.ButterAleks.RandomIdeas.proxy.ClientProxy";
public static final String COMMON_PROXY_CLASS = "com.ButterAleks.RandomIdeas.proxy.CommonProxy";

public static final int TEST_ENTITY = 1;
}

EntityTestEntity

package com.ButterAleks.RandomIdeas.entity;

import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.monster.EntityEnderman;
import net.minecraft.entity.passive.EntityCow;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.DamageSource;
import net.minecraft.util.SoundEvent;
import net.minecraft.world.World;

public class EntityTestEntity extends EntityEnderman
{

	public EntityTestEntity(World worldIn)
	{
		super(worldIn);
	}


	protected SoundEvent getAmbientSound()
	{
		return super.getAmbientSound();
	}
	protected SoundEvent getHurtSound(DamageSource source)
	{
		return super.getHurtSound(source);
	}
	protected SoundEvent getDeathSound()
	{
		return super.getDeathSound();
	}
}

RenderTestEntity

package com.ButterAleks.RandomIdeas.entity.render;

import com.ButterAleks.RandomIdeas.entity.EntityTestEntity;
import com.ButterAleks.RandomIdeas.entity.model.ModelTestEntity;
import com.ButterAleks.RandomIdeas.util.Reference;

import net.minecraft.client.model.ModelBase;
import net.minecraft.client.renderer.entity.RenderLiving;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraft.util.ResourceLocation;

public class RenderTestEntity extends RenderLiving<EntityTestEntity>
{
public static final ResourceLocation TEXTURES = new ResourceLocation(Reference.MOD_ID + ":textures/entity/test_entity.png");

	public RenderTestEntity(RenderManager manager) {
		super(manager, new ModelTestEntity(), 0.5F);
	}
@Override
protected ResourceLocation getEntityTexture(EntityTestEntity entity)
{
	return TEXTURES;
}
@Override
protected void applyRotations(EntityTestEntity entityLiving, float p_77043_2_, float rotationYaw, float partialTicks)
{
	super.applyRotations(entityLiving, p_77043_2_, rotationYaw, partialTicks);
}
}

ModEntitys

package com.ButterAleks.RandomIdeas.init;

import com.ButterAleks.RandomIdeas.Main;
import com.ButterAleks.RandomIdeas.entity.EntityTestEntity;
import com.ButterAleks.RandomIdeas.util.Reference;

import net.minecraft.entity.Entity;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.common.registry.EntityRegistry;

public class ModEntitys
{
	public static void registerEntities()
	{
		registerEntity("test_entity", EntityTestEntity.class, Reference.TEST_ENTITY, 50, 1381653, 0000000);
	}
public static void registerEntity(String name, Class<? extends Entity> entity, int id, int range, int color1, int color2)
{
	EntityRegistry.registerModEntity(new ResourceLocation(Reference.MOD_ID + ":" + name), entity, name, id, Main.instance, range, 1, true, color1, color2);
}
}