Pick a neutral background. Place your computer on something a little bit higher than the table, so it's not awkwardly looking up at your chin. So, computer on top of text book on top of computer. Make sure your sound is good, and your internet connection is reliable. Make sure you are in a quiet place - no pets running in, no people yelling in the background, etc. You can have notes in front of you to help, but don't look at them too much. Look into the camera instead of at the screen so you are actually looking at the person. Hmmm. I'm sure I'll think of more.