1. Use a Sensible User Name
Sounds obvious but choose well. It need to be professional. Get it wrong and you've not made a good impression and at worse might even be dismissed as a serious candidate.
2. Set Up Your Location
Private room with good internet connectivity. Not a coffee shop! Make sure the behind the cam view is suitable. Nice poster, planter will do, Think about the image you want to convey. Want to get into marketing? Arrange to have some books on the subject on display behind you. People will take in your surroundings without you knowing,
3. Get Eye Contact
Try and look at the camera not the screen. Reduce the interview window and do your best to move it as close to the camera as possible. Otherwise the interviews thinks you are not looking at them directly.
4. Light from the front
Use a desk lamp or be in front of a window. Make sure your are not in the dark. Getting good light on your face and checking the colour is a natural as possible will help the process.
5. Webcam Placement
Have the Webcam just below your eye level. If necessary raise up the laptop. No one wants to be looking up your nostrils!
6. Remove Interruptions
Turn off phone, any notifications you have on your device. Notify friends, family or those you share with of your need to be not disturbed.
7. Practice the Tech
Make a call with someone to check sound, lighting, see if it all looks good
8. Have your Documents Ready
Have your CV, job description, notes you made on the company as you've done research on them (of course) of the job and notepad to hand for any things you want to clarify.
9. Dress Formally
It's an interview so dress the part, at least your top half which is on view
10. Use a Headset
If you want to hear better and be heard use a headset as this will cut out ambient noise, cars, dogs barking, cell phones ringing.