Hello,
To have the contact form in a widget you would need to create on in WPForms which you can set to send the results to your email address, We have guides on how to do that here. Once you have the form created you can go to your Dashboard > Customize > Widgets > (pick an area here where you want the widget to show) > Add a Widget and pick WPForms widget and select the form you created earlier. When you go through the inspirations setup it will generally give you up to 5 pages depending on the theme you picked, You don’t have to use them, The home page would be the main page and you can delete all the others ones and just have everything on there. You can remove them by going to Dashboard > Pages > All Pages.
Best Regards,
Kyle M