Tracking device for objects

I am currently looking for resources to help me bring this idea to life, a small tracking device for objects integrated with simcard, gps that are programmable with the Blynk app. This device should be attachable to personal belongings like keys, wallets etc. I am seeking guidance on sourcing a complete set of electronics kits and components needed for this project, as well as integrating the Blynk app as a controller for these tracking device. Any advice or recommendations on where to find these resources as well as how to do this tracking device would be greatly appreciated as I move forward with this project. Thank you for your support!

The reality is that a project of this type isn’t viable with modern battery technology.
Far too much power is required to make GPRS communication viable from a device that’s this small.