Well you are going to be a mage and it seems that you can choose between:
Ooh! Ooh! Can we have throwing potions of acid with our wizard? We must corrode the monsters to doom!
Which would be closer to a thaumaturge. A thaumaturge specializes in the manipulation of the existing physical reality, and are able to switch, manipulate and amplify already existing properties and forces. The class is very flexible, but a lot of what you can do depends on the environment around you.
... If we're named Jericho, can we be a cowboy wizard? A spellslinger?
Firearms in this universe are still stuck at flintlocks and muskets, but there's nothing preventing you from carrying one of those and being a traditional mage, and you can use the magic to greatly modify what you gun can do. This class would be a way stronger ranged fighter at the cost of being much less flexible.