Raspberry Pi, Python Project

Hi I have a Python project running on a Raspberry Pi 4-B. The project monitors a serial input, runs a webserver and send an email when certain parameters change. The project is complete - Except, in order to make it run I have to SSH in, then open a browser on my PC (pointing to the Pi). Works fine after that. I need to have this project start automatically from power up. No human intervention at all. So I need someone familiar with how to do this - must have good English / communication skills. Must be able to fix this in the next few days