1.) 64 max characters, one buck more per month after the first character.

2.) You mean the job that takes you to lvl 75 fastest? BRD, nothing EVER beats the BRD. You can be a complete jackass and you can still get parties with this job. Because simply EVERYONE wants the BRD. But being one as in fun factor can be good, or robotic. WHM, BLM, RDM, PLD, NIN, RNG, MNK(high lvl) and WAR usually are the runner ups.

3.) WAR? under lvl 30, MNK is the best, no contest. After lvl 30, THF can be a good Damager, and MNK is a good tank. Post 60, /SAM is somewhat viable but there are more promising subs. /NIN after lvl 24 and espeically after their Dual Wield II upgrade later is definetly makes it the BEST and most superior sub. It offers good defense and offense, as well as Utsusemi blink to tank better and pull better. So definetly /NIN, with THF and MNK the runner ups.