Sometimes you will need a pure white background, especially for online product listings such as with Amazon.
Light Meter Source Link
Pure White Backdrop Source Link
Lighting Source Link
Keep videos under 5 minutes. For anything longer the video better be awesome.
Get a camera to take pictures and basic videos, a camcorder for quality videos, and a tripod to keep them stable without holding them. Linear rails to slide the tripod is nifty.
A wear-on wireless microphone and sensitive mike works well for quality audio.
Lighting and accessories will also be a big thing.