Toledo,Titan King (though name might change)

(just gona say im not even sure of the plot yet im 14 this is my first serious book idea,hopefully you guys can help me)

basically

in a time long ago the realm was ruled by 10 magicians,each controlling a tanth of the land they together kept law and order and only taught there magic to special law enforcers called the sages(or paladins cant decide) they once had a giant war with a type of mythical creatures called the titans vastly powerfull giants (not giants as such just big) from another realm the titans were subdued and mankind were left in peace,after years of harmony the humans had a war with the even more powerfull race the dragons and just survived a pact was seald with the dragon for peace and they occupy a a big stretch of land called vroengard,

later in amiddst these magicians rose one young sage who quickly learned the way of magic and became very powerfull indeed, Toledo, toledo took control of the magicians and caused havoc one day war broke out between the humans and toledo became victorious killing all the magicians but one(dont know the name) he was forced to flee to vroengard were toledo was not yet powerfull enough to catch him,toledo's power grew and he became almostgodlike noone knew were he whent except for those closet to him and he ruled with an iron fist, toledo was soon powerfull enough to summon the titans from another realm twelve in total ruling over theland under his control

meanwhile the escaped magician saves a boy that was found by the dragons in vroengard and raises him teaching him magic in the hope that he will one day defeat toledo as toledo grows more powerfull he breaks the pact with the dragons and soon the young sage becomes united with dragon kind and becomes the a dragon rider then as gets stronger faces toledos titans freeing up parts of the land and givving the people hope of freedom

but soon it is a clash a new power arises toledos anger at his losses gives him great power and he develops thepower to transform into a titan like form were he will clash against the boy in a final ultimate battle

please respond with your critisism and please help with any ideas or improvements
i as you can see definatly need this help i know my plot is poor and unthought through