https://laravel.com/docs/5.6/eloquent-relationships
My question is, do I have to create a new separate model "meta_users" and then tie it in with my User model. Or can I just use the User model to work with both tables.
You should create it, then you can just use relationships. You'd create the meta_user model, which can be totally blank (just create with artisan).
Then in the User model, you'd create a relationship to the meta_user model like the docs I linked to show.
Then you could just do User::with('meta_user')->get() which would get the user(s), along with their associated meta_user data.