The only macros you should be using on blackmage are simple utility macros. You don't need any crazy macros for swift-cast or flare or any of that seeing as everything is situational. You need to get in the habit of pressing your keys and know where everything is on your hot-bar. Luckly blackmage is one of the easier classes to play and learn.

Aetherial Manipulation - This macro lets you mouse over to a specific player, or always travel to a healer.

/micon "Aetherial Manipulation"
/ac "Aetherial Manipulation" >mo>
/ac "Aetherial Manipulation" <4>

Eye for an Eye - This macro lets you cast eye for an eye on your main tank without having to target him/her.

/macroicon "Eye for an Eye"
/ac "Eye for an Eye" <tt>
/p Eye for an Eye Cast on <tt>

Thunder II - This macro allows you to either cast thunder II or thunder depending on how much MP you have at the end of a rotation. It's used so that you cast thunder regardless of your MP if it happens to be to low for thunder II.

/macroicon "Thunder II"
/ac "Thunder II" <t>
/ac "Thunder" <t>