Percy's in his ordinary world at a high school with his best friend Grover and his only worries are his ADHD and his Dyslexia
Percy's Call to Adventure happens when he is on a school field trip and gets attacked by a mystical creature, learning that he is more than a normal kid and that he has to go save the world, and his mom
Crossing the Threshold for Percy happens when he, Grover, and Annabeth leave the camp and go into the unprotected world to find Percy's mother and save her from Hades.
The three heroes face three tests in order to get the pearls they need: Medusa, Hydra, and the Lotus Cassio. Once they have their pearls they bring the final fight to Hades, where they find the lightning bolt in Luke's shield.
When Percy brings Zeus his lightning bolt, he gets the reward of his mother being safe, along with Grover who Zeus brought back from the underworld. He also gets to meet and speak with his dad for the first time in his life
After saving the world from a deadly war, Percy returns to Camp Half-Blood to continue his training and be protected from the mystical creatures that roam the earth.