I don't think I am explaining it well enough. You get tons of different weapons, but they fall under a category when equip you are that class.
Disciples :
There are 4 disciple types in the game. Disciple types in FFXIV are nothing more than general headings for the 4 different methods to do anything in game. They are Disciples of War (using physical weapons for battle), Disciples of Magic (using magic for battle), Disciples of the Land (gathering), and Disciples of the Hand (crafting). Disciples have no levels and cannot progress in any way, they are nothing more than descriptive headings. Classes:
Each class can be leveled from 1 to 70, but unlike many other games, a single character can level up as many classes as they wish. To change your class, simply equip the weapon / tool specific to the class you want to become anytime you are NOT in combat. You must finish the initial tutorial quest line before you can change jobs (the level 10 tutorial quest allows you to change class but it is not practical to collect all the classes until you unlock airship travel from the level 15 story quest). You must also talk to a different NPC once for each class to unlock it (the NPC is always the head of NPC guild for the class found in one of the 3 capital cities). If you level a Marauder to 35 and then decide to try healing as a Conjurer, just change your weapon to a wand and you will be set back to level 1 to start leveling as the new class. If you change back to a Marauder, you go back to level 35 and continue leveling it from where you left off. Your base stats change depending on your current class and level.