Sometimes your live online tutorials and classes may require plenty of handwriting and drawing. In this case it is reasonable to use a digital pen or a digital tablet (writing pad) attached to your computer.
Handwriting with such a device is easy and Electa Live provides a handwriting tool on its whiteboard toolbox.
You may consider any such device that is compatible with your computer. It is just a matter of preference to choose one.
Alternatively, you may use an iPad/iPhone device or any touch-screen computer for finger writing on the screen surface.