Here’s the biggest fundamental error in this template, which tends to infect the whole fantasy genre: As a general rule, if someone hands your hero a map and a plan at the beginning of the movie, the hero needs to realize at some point that the map they’ve been given is wrong and the plan is inadequate. They need to start charting their own territory. They need to improvise. Frodo manages to trudge through three super-size movies without ever taking charge of his own story. At the end, he does exactly what he was told to do ten hours ago: toss the ring into the volcano.
Don’t do this. CBS had a rule when they did the old “Mission: Impossible” TV show: no matter how well-planned the mission was, the plan had to genuinely fall apart halfway through, and the team had to improvise for the second half. That’s a good rule. The story kicks into high gear when the hero throws away the map.