Need to add data in two tables

i have downloaded a script running laravel 5.2 and in a process users need to register before adding some list (list <- child table) and this works fine. What I need to do is combine registration together with a 3 lists. Therefore, registration still goes to users table and list goes to list table. Do I need to specify this in model?

I have this code so far.

ListingUserController.php

use Auth;
use App\User;
use App\Listings;
use App\Categories;
use App\SubCategories;
use App\Location;

use App\Http\Requests;
use Illuminate\Http\Request;
use Session;
use Intervention\Image\Facades\Image; 
use Illuminate\Support\Facades\DB;

class ListingsUserController extends Controller
{
    public function submit_listing()    { 

    $categories = Categories::orderBy('category_name')->get();
    $locations = Location::orderBy('location_name')->get();
    return view('pages.addeditlisting',compact('categories','locations'));
}

public function addnew(Request $request)
{   
    $data =  \Input::except(array('_token')) ;
    $rule=array(
            'category' => 'required',
            'sub_category' => 'required',               
            'title' => 'required'
             );
    
    $validator = \Validator::make($data,$rule);
    if ($validator->fails())
    {
            return redirect()->back()->withErrors($validator->messages());
    } 
    $inputs = $request->all();
    
    if(!empty($inputs['id'])){
        $listings = Listings::findOrFail($inputs['id']);
    }else{
        $listings = new Listings;
    }
    
    $listing_slug = str_slug($inputs['title'], "-");
    
    if(empty($inputs['id'])){ 
        $listings->user_id = Auth::User()->id;
    } 

    $listings->cat_id = $inputs['category'];
    $listings->sub_cat_id = $inputs['sub_category'];
    $listings->location_id = $inputs['location']; 
      
    $listings->save();

    if(!empty($inputs['id'])){
        \Session::flash('flash_message', 'Changes Saved');
        return \Redirect::back();
    }else{
        \Session::flash('flash_message', 'Listing Added');
        return \Redirect::back();
    }                  
     
}

IndexController.php

namespace App\Http\Controllers;

use Auth;
use App\User;
use App\Categories;
use App\Listings;

use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\DB;
use Intervention\Image\Facades\Image; 

class IndexController extends Controller 
{

public function register()
{            
    return view('pages.register');
}

public function postRegister(Request $request)
{ 
    
    $data =  \Input::except(array('_token')) ;
    
    $inputs = $request->all();
    
    $rule=array(
            'first_name' => 'required',
            'last_name' => 'required',
            'email' => 'required|email|max:75|unique:users',
            'password' => 'required|min:3|confirmed'
             );
    
     $validator = \Validator::make($data,$rule);
 
    if ($validator->fails())
    {
            return redirect()->back()->withErrors($validator->messages());
    } 
           
    $user = new User;

$user->first_name = $inputs['first_name'];  
$user->last_name = $inputs['last_name'];
    $user->email = $inputs['email'];     
    $user->password= bcrypt($inputs['password']); 
       
    $user->save();
        
        \Session::flash('flash_message', '<b>Register successfully!');

        return \Redirect::back();
}

Any help would greatly appreciated and helps me a lot.

Need to add data in two tables

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