I wish we could sticky a forum thread in the Writing Workshop that could summarize the answer to this meaningless discussion, because the most common topic here is "Guys please, I really want to write this amazing story, but I have literally no ideas, what am I supposed to do!?!?!?!?!?!?!?!"
Ideas should come naturally to anyone who has a modicum of imagination. If you don't have any ideas, there are plenty of ways to brainstorm them: you can watch a movie, but watch it for the overarching plot, not just random scenes (although random scenes can also be helpful, because you can analyze what that scene is doing within the movie and try to emulate that feeling with your writing), or you can read a book, fictional or not, and take note of everything the author does to make you interested, what works and what doesn't, and what personally appeals to you. Another neat way to come up with ideas is by playing a sandbox game where you can come up with stories behind random events within the game world.