Class basics

In kingdom heroes there are 4 main classes.
Warrior
Fencer
Tactician
Conjurer

As the game progresses these branch into advanced classes at level 120 with talents needing level 240 to learn the final ones, known as the 2nd class upgrades of these base classes, these are:
Warrior----> Tiger Captain, Fang Captain
Fencer-----> Blade Master, Imperial Guard
Tactician---> Scholar, Strategist
Conjurer---> Mystic, Taoist

According to the kingdom heroes developer blog, there is a final class 3rd class planned starting at level 240, considering the pattern of 120 levels for first class and another 120 levels of 2nd class to reach 240, its speculated that the final 3rd class will be an additional 120 levels to finish at level 360.
It was mentioned that the final 3rd class will also be 2 classes per 2nd class, so for example:
Tiger Captain-----> final class 1, final class 2
Fang Captain-----> final class 1, final class 2
Blade Master-----> final class 1, final class 2
Imperial Guard--->  final class 1, final class 2
Scholar-----------> final class 1, final class 2
Strategist-------->   final class 1, final class 2
Mystic----------->  final class 1, final class 2
Taoist----------->   final class 1, final class 2

This is a total of 16 final classes with an expected final cap of level 360

In summary
0-120    Base class
120-240 2nd class
240-360 3rd class

As of this time, the US version of kingdom heroes only has level 150 cap with 2nd classes, i personally have played many 2nd class characters but "soon" we will get the new expansion with level 200 cap+ new maps/items/mobs and all sorts of new content etc

In further posts i will start describing them in detail with recommended builds for stats/talents and what each class really does etc