After completing your advert story board, if you want to have a go at filming your advert either with stop motion animation or with real life people, go for it!
The animation app we have on the iPads at school is called 'I Can Animate!' but there is a list of free apps for animating here: https://freeappsforme.com/stop-motion-apps/ that you might want to take a look at.
To edit your videos, iMovie is the inbuilt free app on Apple products that will be useful. On Android devices, there is a list of free apps you could try here: https://filmora.wondershare.com/video-editor/android-video-editor.html