Having an instructor is nice, but a patient friend who you trust will also work.
The throttle is more sensitive than you'll expect at first. Automatic cars roll forward slowly unless you hold the brake. Old cars have less sensitive brake pedals - that's normal, not a sign of anything being worn out/broken.
Be confident. You will make mistakes, but you'll make fewer mistakes if you don't let mistakes get to your head.
When waiting to make a left turn, creep forward into the intersection. It will feel weird at first, but it makes traffic flow much more smoothly.
Take turns in counterclockwise order at stop signs. If people are going in clockwise order for some reason, do that instead. Just go with the flow. If you aren't sure when your turn is, wait for an awkward pause. The awkward pause means it's your turn (probably).
Use cruise control on highways. Nobody likes Lead Foot McGee and his magic fast-downhill-slow-uphill band.
Use your mirrors, and use your turn signals. This should go without saying, but I have to say it.
You're in New York. That's a hard place to learn to drive. But, if you become a good driver in New York, you'll be able to drive competently just about anywhere in North America.