I've always dreamed of being the kind of journalist who gets sent on assignments and travels to get the story. How do you get these type of assignments where a publication sends you to get the scoop?
The short answer is that you have to be pretty established. At the very least, you need to be well-known by the editors: You typically need to have written several things for them before, or have written many things that they've read elsewhere, in order for them to think of you when they have an assignment to fill.
In the meantime, the best way to get there is to pitch them good ideas that are tailored to their specific publication.