1. Plugin recommend is always appear on dashboard although it will not work automatically.
2. What type of template are you referring about? If you need additional design or style, you can create separate template. If you just want to change the widget on current homepage you can check Appearance -customize – Home Main content area.
In case if backup, we strongly recommend you to backup your site regularly either in server or do it manually.
If you are familiar with codes, you can create template yourself easily. Just google Create WordPress Page Template, you will get lots of result to help you. Please try it out.
Regards