Hi I am senior in high school who has no idea about bluetooth and bluetooth devices. For an engineering course that I am taking right now, I have to design and build a button that can be bluetooth connected to a phone in which the phone would then send your GPS signal to the police. I currently have no idea where to start and could use some guidance on what I can buy to build my project. Thanks
They also provide a mobile app that's easy to use for prototyping your app.
With that said, I'm not sure how to send your phone's GPS signal to the police with a Bluetooth only device. You will need some form of cloud connectivity (secure, the police would then have access to the same cloud) and an app on your phone. Developing iOS and Android apps of this type would be outside the scope of this community.
You could also use a combo (BT/WiFi) device/eval board, pair it with your phone, exchange GPS data, then send it over WiFi. This isn't a trivial app though. You may want to check some of the maker communities (Adafruit, Particle, etc.) to see if there is an existing app you can leverage.