Create a storyboard that takes you from beginning to end. If you don't have a post-editing system, you must shoot from start to finish without stopping. If your film is exciting and expresses your point well, your audience will forgive the lower quality of your streamed clip. Because the final product, your subject, will be seen in such small size, you don't want surrounding items to distract the viewer. Move items out of the way or bring your shots inside in an environment you can control.
Motion is the main enemy of web streaming.
Changes of scene from one frame to the next are what contributes to frame complexity. The more complexity, the more detail gets dropped during the compression process. Outdoors use bounce cards to soften hard shadows. The best times to shoot outdoors is early morning or late afternoon. If you do use an on-camera light, soften it with diffusion fabric.