Randy,
Set your project setting to the media you’re using. If it’s 1920, setting should be 1920. You can use the get settings from media file button to be sure. Then if you want to deliver in a different format, change it in the render.
It would help you to understand media formats. Look for some tutorials on youtube to get you started.
It will get easier as you gain understanding. Pretty soon you’ll be answering these questions.
Jeff
Windows 7 64-bit, ASUS P6X58D, i7 960 3.20GHz, 24.0GB DDR3, 12TB connected storage