General Warlock:

#showtooltip Summon PetTypeHere
/cast Soulburn
/cast Summon PetTypeHere

Casts 'Soulburn', then summons whatever pet type you put in the 'PetTypeHere' slot.

/equip trinket 1513 - this will put the trinket that you type the name of into slot 15, which is your first trinket slot.Your second trinket slot is 16 14. You could also just use gear sets from your character screen. Edit: I was incorrect on the trinket slot numbers. If you want to have more control over your trinkets, as would be the case with a PvP trinket, you can make simple macros such as these: Top Trinket Slot /use 13 Bottom Trinket Slot /use 14. The nice thing about these macros is that they’ll show you which trinket you actually have equipped. The slot is a number that corresponds with its identity in game. Trinkets are the most commonly useable equipped items, so this command is most applicable to the trinket slots: 13 and 14 (a full list of slots appears below). Thus, a macro to activate whatever trinket is in your top trinket slot would include the command /use 13.

#showtooltip Summon PetTypeHere
/cast Soulburn
/cast [nomod] Summon Succubus ; [mod:alt] Summon Felhunter ; [mod:ctrl] Felguard ; [mod:shift] Summon Imp

Casts Soulburn, then whichever pet you want to summon, depending on which modifier you're holding down.

#showtooltip
/focus [mod]
/clearfocus [mod:alt]; [target=focus,dead]
/cast [@focus,harm,nodead] Fear

If holding down a modifier, you will set your focus on your current target. Your focus will clear if your target is dead,
or you hold down alt while using this macro. If you're not holding down anything, you will cast 'Fear' on your focus target.

#showtooltip
/stopmacro [channeling]
/cast Rain of Fire

Casts 'Rain of Fire' if you're not channeling already, the macro stops if you're channeling already.

#showtooltip
/cast [mod] Ritual of Souls ; Ritual of Summoning

Casts Ritual of Souls if you're holding down a modifier, otherwise, it casts Ritual of Summoning.

Affliction:

#showtooltip
/cast [mod:shift] Immolate
/cast [mod:ctrl] Curse of Agony
/cast [mod:alt] Corruption
/cast [nomod] InstantDamageSpellHere

Casts 'Immolate' if you're holding down [shift], casts 'Curse of Agony' when you're holding down [ctrl], casts 'Corruption'
if you're holding down [alt]. Put any instant damage spell in the last slot, it will be casted if you're not holding down a
modifier.

/castsequence reset=target/combat/5 Haunt, Curse of Exhaustion

Casts 'Haunt', then 'Curse of Exhaustion' with another use. This macro resets when you swich targets, combat is engaged or disengaged,
or 5 seconds pass by after casting 'Haunt'.

#showtooltip
/cast [mod:alt] Soul Swap
/assist [mod:shift] focus
/cast [@focustarget, nomod] [] Soul Swap

You can set your focus to your tank, or whoever your raid or party leader says to assist. This will cast 'Soul Swap' and inhale
your dots if you're holding down [alt]. If you're holding down [shift], you will target your focus target's target. Lastly, if
you're not holding down any modifers, you will cast Soul Swap on your focus target's target. This will only work if 'Soul Swap'
is nowhere else on your bars.

#showtooltip
/cast [button:1] ; [@focustarget, mod, nodead] Soul Swap
/assist [mod] focus

This is another way to write the previous macro. If you use the macro with 'button 1', you will inhale your dots. If you use any other
button other than 'button 1', you will cast 'Soul Swap' on your focus target's target. Holding down any modifier and using this macro
will assist your focus target.

#showtooltip Drain Soul
/use 13
/use 14
/cast Demon Soul
/cast Drain Soul

Use any 'use' trinkets you may have on, then casts Demon Soul and Drain Soul.

Demonology:

#showtooltip Curse of Agony
/use 13
/use 14
/cast Metamorphosis
/cast Demon Soul
/script UIErrorsFrame:Clear()

This uses any 'use' trinkets you may have on, casts 'Metamorphosis', then casts 'Demon Soul' and 'Curse of Agony'.

#showtooltip Hand of Gul'dan
/cast Demonic Empowerment
/cast Hand of Gul'dan

Casts 'Demonic Empowerment', then casts 'Hand of Gul'dan'.

Wow Macro Use Slot 13 +

#showtooltip SpellNameHere
/cast [@pettarget, exists] Felstorm
/cast SpellNameHere

This will link your Felguard's 'Felstorm' to any of your spells to keep them on cooldown. Useful for Single-target fights.

Destruction:

#showtooltip Incinerate
/cast [@pettarget,exists] Firebolt
/cast Incinerate

This will help your Imp cast faster and keep them on their toes. It tells your Imp to cast 'Firebolt' continually as you cast
'Incinerate'. You can bind your Imp's 'Firebolt' to any spell you want, even all of your spells.

Take care of your UI, if you set it up properly it will make your time in the game a lot easier.

Remember, what works for someone else might not work for you, but I highly recommend the following addons.

Weakauras - The most powerful addon in the game (in the right hands it can do pretty much anything you would ever want)
Bigwigs / LittleWigs or Deadly Boss Mod - Timers for dungeons and raids
Details - It has more uses than just damage, explore it and you will find a lot of useful information.

Macros

Wow What Is A Macro

Combustion Macro

This Combustion macro uses your troll (or Orc racial), your on-use trinket on slot 14 and Combustion at the same time.

Remove Curse Macro

Uses Remove Curse at your cursor location.

Alter Time Macro

Removes the Alter Time buff in case you regret using it.

Use Item Macro Wow

Fire mage doesn't require many WeakAuras. There are only 3 types of must-have WeakAuras that show you:

Wow Macros Guide

The duration and charges of Infernal Cascade
The duration of Firestorm
The duration of Combustion

Wow Macro Use Slot 13 Inch

You can search for individual WeakAuras above or collections and find ones that work for you from wago.io.