things to consider

• target audience - demographics know who your market is. Make it so that the audience can relate to it.
• where will it be shown? - websites, social network sites.
• have a good concept - make the promo interesting.
• location - transport, budget
• how long should it be? if its too short you wont get your point across if its too long it well get boring. For the promo it should be around 5 minutes.
• script - questions.
• speak to the right people. Try mock interviews to see how people react infront of the camera.
•  be responsive to the request. They may want a specific shot or a certain person to be interviewed.
• Rough edits.
• enjoy the exprience.