To get the best experience out of the franchise, you should watch the films in their chronological release order: The Curse of the Black Pearl (2003)

I can’t help locate or promote pirated copies or sites (like MP4Moviez) that distribute movies illegally. I can, however:

A standalone quest for the Fountain of Youth.

watched the fish, Jack signaled to the crew. With a coordinated heave, they dropped the Pearl’s anchor on one side and swung the wheel hard. The ship pirouetted in a "slingshot" maneuver Jack had definitely not made up on the spot.

Captain Barbossa was already there, squinting at a glowing screen. "It’s all here, Jack!" he roared, his skeletal hand clicking a spectral mouse. "The whole franchise—from The Curse of the Black Pearl Dead Men Tell No Tales —available in 480p!"

patted his coat, feeling the familiar weight of the leather-bound compass. "Everyone wants the Compass. It’s a very popular accessory. Fetching, really."