This is a crap-ton of information for you to better understand the story (and for me to type my ideas as they come) if it's confusing I'm really sorry about that but I'm not even 13 yet so give me a break on spelling and going too fast.

Dragonia:

valoria: the largest and most powerful kingdom, better known as the land of magic. It's where magic originated from and is strongest, most animals that have magic were born and live there (dragons, goblins, ogres). Very few people live there because of the nomus. The nomus are creatures made by valorias corrupt ruler ,king Hisashi, to keep him in control of magic. Not much is known about the king, just that he was stranger who won the hand of the heir to the throne, the kings daughter, after wining a tournament and demanding they marry. He became king, killed the old royal family and his wife vanished

Yuuei: the land of heroes. It's a pretty small kingdom but it's where people come to become heroes. Heroes are the people who fight back against the nomu and bad, so people live there because it's safe, making it crowded but wealthy (its kinda like a medieval popular city, like Tokyo or NewYork) their king is toshinori yagi, known as the hero All might. He's known for being kind and prefers to go around doing heroic acts instead of the things the king usually does, leaving the kingly duties to nedzu, his super intelligent supervisor. Yuuei isn't known to have very much magic.

Musutafu: musutafu is a large kingdom, most people live there in small villages, the only crowded place being the capital where the castle is. Most of the land is either used in farming, open land or forests. The ruler of musutafu is king Naomasa, who's known for being kind and fair. Musutafu neighbors Valoria so they have a bit of magic.

Volcane: the land of volcanos is large and has mountains full of treasures. Their ruler is king enji, better known as the hero endeavor. He's a harsh but powerful man, he's also greedy and sends most his men out to mines to bring him diamonds and gold. Volcane and yuuei have been at war for centuries, only recently coming to a "truce". It's really only a matter of time before one accuses the other. Volcane has very little magic.

Dragon tribe: the dragon tribe is a well known and fierce tribe that lives at the edge of valoria. They're the only group of people who lives in valoria and are sometimes seen at the borders of musutafu. The people are known for being ferice and strong, and they wear simple clothing, the men often shirtless and woman only wearing shorts and fabric wrapped around their chest. They ride dragons and know more about them than any other group of people, but they've never accepted an alliance with any of the kingdoms. They have a long line of Bakugo chiefs but they're anything but traditional tribes, they don't wear face paint and don't have feathered headsets. All in all, little is known other than they are ruthless fighters with dragons who keep to themselves.

Dragons: dragons are usually only found in valoria. Dragons come in many different variations but usually they are one of the elements: fire, wind, nature, water, lightning and earth. There are sub categories when they cross breed ( nature water dragon might have small chance of having a poison or flower dragon. Wind water could have an ice dragon, etc) but they're rare and dragons prefer to breed with dragons of the same element. The size of dragons depends on their element, earth dragons being the largest (about the size of a 2 or 3 story large house) water dragons the smallest (about the size of toothless from how to train a dragon). Dragons are said to be very dangerous to most but to some are actaully kind creatures.

Please don't expect me to be good with my words, I just had an idea and I'm acting on it. If you read story's for how well they're written this isn't for you if read them for the story , I hope you enjoy