For my two characters: race/name/starting city, I know for sure. Appearances, it took me up until now to round things out, but I'm fairly confident about both models as well (apart from hairstyle on my Miqo'te but that's presumably going to be changeable). Beginning classes... I THINK I know (Conjurer, Archer, Botanist, Weaver, Leatherworker for one; Lancer, Gladiator, Miner, Armorer, Blacksmith for the other). That doesn't include what I plan on sub-leveling though. Long-term? I have no idea. All I know is that I'll PROBABLY end up trying to max out both of their specializations/starting classes before I start expanding into more generalized territory for both of them (in other words, maybe giving the Miqo'te a straight-up DD class, or the Hyur a caster class).
This part isn't so much about a specific character's path as it is about my path as a whole... When I played FFXI, I got to a point where I really wanted to play a second character. However, my "main" was so far advanced that I felt like I wasn't doing her any justice if I were to level something on a different character. ("Why not just level it on Kaelia instead and make her more complete?") So it got to the point where I ended up starting a second character, but only if I forced myself to stick with jobs Kaelia already had leveled. Obviously, that was pretty counter-productive. I'm hoping that by starting out with two characters I will avoid feeling like I'm short-changing one or the other. My resolution for FFXIV is to just enjoy the ride, so I'm not terribly concerned about feeling like I'm getting somewhere half as fast as I should be. As long as I keep up with where my boyfriend is at, I'll be happy.