Hello,
I have read the description, I did so many videos like this.
I'll create a variety of ratios and sizes for the video to fit social media channel's requirements.
I'll create 1080X1080 for Instagram, 1080X1920 for Snapchat, and Full HD 1080p to fit other channels like FB.
Also, it will have an Intro & outro with your logo & as you said the videos were made by iPhone so maybe there is a camera shaking so I will fix it and make the video more stable.
Thanks, hoping to work together soon