I'm very new to coding and my project is a little ambitious, but I want my Arduino Uno to measure the pulse of a person, and once it reaches a certain threshold or height, there is a reaction physically on the body. I am just very unsure where to start, and this is literally due in a week so I'm kinda freaking out. Figured this place would be better than reddit lol. If you have any advice or input everything is appreciated. Thank you! 
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What sensors do you have that will sense a person's pulse? Have you tested it? Does it work?
With one week there isn't much chance of starting from zero and getting all the way to something that measures pulse rate and then create a
reaction physically on the body
So for now, try to make one LED turn on when you press one button, and turn off when you press that button again.
Then see if you can measure and print the time between the one button press and the next, which would be each the time the LED was on and off.
Finally print a nice message if someone presses the button fast enough for a few times.
Now you can think about the components needed to really use heartbeats instead of a pushbutton, and for whatever you mean by a "physical reaction" on the body.
You can find beginning code in the IDE examples, certainly enough to make a stab at the turning on and off one LED.
You might enjoy using the wokwi simulator as you work through the IDE examlkes and other small things you turn up with your friend google. It will relieve you for the moment of scrounging parts, fussing with wires and power supplies and any need to worry about expenses or damages.
When you have the software working and the hardware identified, the real world fun can begin.
I don't know what percentage of your waking time you have to devote to this. A week for just a demonstration of a concept of an idea about what to do might be possible.
a7
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https://docs.arduino.cc/built-in-examples/
Or: IDE >> FILES >> EXAMPLES >> BUILT-IN EXAMPLES
Your problem.
update: I did it lol thanks guys for the help
I used the sensor from pulse sensor.com, works great and came with lots of code I could adjust and work with
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