(part 1 of 2... again... XP)
No prob.
Hmmm, that's a good question. You can finish the game with a single class, though, unlocking the coordinating class(es) is useful too. I've gotten all of them, besides Paladin & Hunter, since I wanted to try most of them. As a recommendation, I would do the coordinating class for merc and miner to start, which would be the blacksmith.
Alchemist is useful too so you can save some dosh and make your own potions. And the tailor can make some armor too at higher ranks, but not sure if they'd be useful for a merc per se. From there, you can try out the rest and see what you wanna do. I probably will get the other two licenses at some point after I beat the game, as I'm a completionist... or I at least try to be. XD
No prob.
Alchemist is useful too so you can save some dosh and make your own potions. And the tailor can make some armor too at higher ranks, but not sure if they'd be useful for a merc per se. From there, you can try out the rest and see what you wanna do. I probably will get the other two licenses at some point after I beat the game, as I'm a completionist... or I at least try to be. XD