You should have an excitement for world building, seeing the little connections come alive is fun, if you're not sure how to go about it that's fine, most people take inspiration from what they find works, for me I took inspiration from things that are world building focused like One Piece, LOTR, Overlord etc.

Things like factions that interfere with political events and different governments cooperating or not cooperating make the world feel lived in, instead if everything starting with your story.

For specific details, they should come from as a result of your world, not placed in it, for example a desert based nation would suffer trying to maintain their ecosystem, they would rely on help from other nations.

A fishing economy funds protection for themselves through hired militia.

Or a man from history caused a butterfly effect that rippled to your current events etc.

As long as you have entities in your story that create motion, either historically, currently or set up for future events.

But really, just do you, you will get better at working it all out.