How should I bootstrap my web app using Backbone.Marionette and requireJs - backbone.js

Question

Let's say my app works but I love to learn and to find the best way of doing things.
I really appreciate this post about Reducing Backbone Routers To Nothing More Than Configuration.
And the following bbclonemail which is not using requires.
Actually my implementation is a monolithic block (app.js, router.js).
Here's my questions:
1) What should the router module router.js return?
2) How should I remove The Callback Functions from router.js ?
3) What should the app module app.js return?
4) How should I decouple the app.js in many others apps (for example: main, tasks, projects)
app.js
// app.js
define([
'router'
// some modules
],
function (router, Backbone, HeaderView)
{
"use strict";
var myApp = new Backbone.Marionette.Application();
myApp.addRegions({
header: '#header',
sidebar: '#sidebar',
mainColumn: '#main-column',
rightColumn: '#right-column'
});
myApp.initHeader = function () {
var headerView = new HeaderView();
myApp.header.show(headerView);
}
// many others many views
myApp.start();
myApp.initialize = function() {
router.initialize();
Backbone.history.start();
}
return myApp;
});
router.js
// router.js
define([
// some modules
],
function (Backbone)
{
"use strict";
var AppRouter = Backbone.Marionette.AppRouter.extend({
routes: {
tasks: 'tasks',
projects: 'projects',
// many others keys/values
'*defaults': 'home'
},
getApp: function ()
{
var mainApp;
require(['js/app'], function (app) {
mainApp = app;
});
return mainApp;
},
home: function()
{
var app = this.getApp();
app.initHeader();
app.initSidebar();
app.initTaskDetails();
},
// many others callbacks
});
var initialize = function() {
new AppRouter;
};
return {
initialize: initialize
};
});

Answer 1

For the Router part you should make like this:
router.js
// router.js
define([
'rooterController'
// some modules
],
function (Backbone, rooterController)
{
"use strict";
var AppRouter = Backbone.Marionette.AppRouter.extend({
routes: {
tasks: 'tasks',
projects: 'projects',
// many others keys/values
'*defaults': 'home'
}
});
return new AppRouter({constroller: rooterController})
});