I am completely new to MVVM and I am creating an UWP app for keeping track of my software development, I am still learning.
So what I want to make is:
An app that contains single page ->
In MainPage.xaml I have something like this:

<!--MainPage Content-->
<Grid>
    <!--For SearchBox-->
    <AutoSuggestBox x:Name="SearchBox"/>

    <!--For Adding Item-->
    <AppBarButton x:Name="AddAppButton"/>

    <!--Listview that contains main data-->
    <ListView x:Name="AppsListView"/>

    <!--This is DataTemplate of listview-->
    <DataTemplate>
        <Grid>
            <!--Icon of App-->
            <Image/>
            <!--Name of App-->
            <TextBlock/>
            <!--For Editing Item-->
            <AppBarButton/>
            <!--For Deleting Item-->
            <AppBarButton/>
        </Grid>
    </DataTemplate>
</Grid>

In Model I have something like this:

public class DevApp
{
    public string name { get; set; } // For App Name
    public string Iconsource { get; set; } // For App Icon
    public ICommand EditCommand; // For Edit AppBarButton
    public ICommand DeleteCommand; // For Delete AppBarButton
}

In ViewModel, something like :

public class ViewModel
{
    // For ItemSource of ListView
    public ObservableCollection<DevApp> DevApps = new ObservableCollection<DevApp>();

    // For Add AppBarButton
    public ICommand AddCommand;
}

Now this is me first time trying to create a neat and clean Mvvm app. Now I have this question:

1. I know how to bind command to button or AppBarButton but how am I supposed to bind a Methods of a Xaml Control such as Listview's SelectionChanged() or AutoSuggestBox's TextChanged() Methods to ViewModel ?
2. How can I Load Data from save file ? As there is no InitializeComponent() in ViewModel like in CodeBehind to start from, where shall I pull LoadData() method which loads data to ListView ? ( my viewmodel is bind to view using <MainPage.DataContext> and I wanna keep code behind completely empty. )
3. Where shall I put Data class that can manage load save and edit data to savefile.
4. How shall I distribute responsibilities among classes ?
   I have seen people using mvvm and they create files like:
   services, helpers, contracts, behaviours, etc.
   and I have seen same thing in Windows Community Toolkit Sample App Is it required for Mvvm. And what are services and helpers.
5. Shall I really use Mvvm for this ?
   I tried using Mvvm in this just for curiosity but like
   ITS BEEN 1 MONTH I AM MAKKING THIS APP! but it gets messed up again and again,
   If I used Code Behind it would have been done in few days. BY time now I realize that Mvvm is good at data bind in complex apps but
   When it comes to simple things like a simple app with listview, I think code-behind
   is better and it keeps things simple.
   Please answer these questions I am really struggling in making this app.