Welcome to Gaia! ::

The best(or most common) subjobs are /whm and /nin for bst. from 1-10 you shouldn't have much of a problem but I often sub /whm for most jobs anyways.

But ummm this allakhazam guide pretty much explains everything ; ; (wish I could explain it but they explain a whole lot better ^^ )

http://ffxi.allakhazam.com/db/jobs.html?fjob=8;mid=1149830035201404772;num=32;page=1

Although from 1-20 it is possible to join parties and level quicker if you want experience it is best to do it from 10-20 soloing(lol I had a hard time from 30-35 because I had some many party time crying )

Also telling your pet to stay and heel is an alternative to leave (to get your pet to die and get full experience points)

Well charming EM mobs are ok, but thats when you start having charm gear etc :p.

Forgot to mention, they alsop have a bst leveling spot topic somewhere... but it had to be revised because of the patch a while back, it should still be somewhere in the bst part of the forums... just that it isn't stickied anymore.