There are a few things you need before starting to draw on videos with an iPhone. First, you’ll need a video editing software like Adobe Photoshop or Apple’s iMovie. Second, you’ll need a webcam and an iPhone or iPad. Finally, you’ll need some basic drawing tools like a pencil and paper. To start drawing on videos with an iPhone, first open the video editing software and create a new document by clicking the “New” button in the top left corner of the screen. In this new document, name the document “Drawing on Videos.” Next, select the “Video” tab and click on the “Create” button to start creating your drawing. You can use any type of paper as long as it’s at least A4 size. You can also use any type of pencils and paper - just make sure that they’re sharpened so that your drawings are clear and easy to see. When you’re finished creating your drawing, click on the “Save As” button in the bottom left corner of the screen to save it as a PDF file. Then open up your PDF file in Adobe Photoshop or Apple iMovie to finish up your drawing!