You can make a perfectly decent video using a smart phone/tablet. If you have specialist equipment please use it - but you probably don't need to ready this!
If you are filming in schools you must follow current guidance on social distancing and other controls when making your film. These ideas and suggestions may not be possible but could give you some ideas.
If you are using a phone/tablet have the device sideways/landscape - this will help when we come to edit the final film. if possible, place it on a stand/solid surface and if you have to hold it try to stay as still as possible. Make sure you do not accidentally cover the camera/microphone hole with your hand.
You will need two devices to make your film. One will be used to play back the Youtube backing track and another to make your video.