Hi Drama Queen! Intersections really aren't that bad. I'd say the rules pretty much are:
Go if the light is green (and after you are sure someone coming from the other direction won't be running their red light. Try to anticipate a yellow/red light by observing how long the light ahead of you has been green. If it's been "green" awhile, be ready to stop. The pedestrian crossing lights at the upcoming intersection will help you, too. If the light indicates "cross" for the pedestrians walking the same direction you are driving, you'll know that you have plenty of time to get through the light. If the crosswalk light is flashing or says "Don't Walk", then you should be prepared to stop.
At intersections controlled by a stop sign, the first vehicle to the intersection goes first. Then the rest of the vehicles go in order of arrival. If just two vehicles arrive at the same time, the vehicle on the right should proceed first. If in doubt, let the other vehicle go first.
Drama Queen, that's pretty much it. Don't be nervous!

All the information you need to pass your driving test will be in the driver's manual that your state issues. Best of luck on your test!