As for world building, I basically start from scratch. I made up a map at random and placed a few large cities at random and a few geographic features. This particular map is basically a continent, bordered to the north by ocean, south and west by hostile deserts, and east by mountains. I named the large cities and so far have really only planned out 3 of them. I do that by starting with the political areas, form of government and local power structure. Then I'll map out the cities a bit, and start baking up a handful of characters to really flesh it out. Local history is fun and a good way to introduce lore. The current city in our campaign is called Valport. Because it's a port in a big valley. Things can be as simple or as complex as desired. I have a couple other cities on the map, located on two fingers of a larger peninsula. One of them sits out into the ocean pretty far and is called Watchpoint, the other is slightly lower on the map so I called it Lower.
There are no chickens in this world. They do have what I would describe as plump iguanas with useless wings that fill the same roll, as food and a source of eggs. For all intents and purposes, they are chickens, but they're not chickens. They are called draggins and are the closest anyone has ever seen to a mythical dragon, "Those are made up creatures for children's stories." Never mind that they will later be a part of the deep lore I'm still working on. For now it's just fun.
Mostly I'm sharing all this to help anyone looking for ideas or wondering how to get started. I really like playing, but I prefer seeing my worlds come alive, seeing how other people interact with these things I've created. If you've ever played a ttrpg, and wondered what it would be like to run one, go for it. It's super fun.