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Hey there, and welcome aboard to the RPC and FFXIV! 
There's a section in the Encyclopedia Eorzea toward the back that covers the specifics of job classes, such as Black Mage. My general knowledge of them is that the core of actually playing a Black Mage in RP pretty much means they'll be evil in nearly all cases due to the destructive nature of the power they seek to wield. RP'ing as an evil character brings with it a whole other set of challenges- for example, they may likely spend their time in hiding for fear of persecution for the abilities they use. Still, read over that part in the back- should tell you pretty much everything you need to know!
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There's a section in the Encyclopedia Eorzea toward the back that covers the specifics of job classes, such as Black Mage. My general knowledge of them is that the core of actually playing a Black Mage in RP pretty much means they'll be evil in nearly all cases due to the destructive nature of the power they seek to wield. RP'ing as an evil character brings with it a whole other set of challenges- for example, they may likely spend their time in hiding for fear of persecution for the abilities they use. Still, read over that part in the back- should tell you pretty much everything you need to know!