The Educator background CAN be really good, depending on your build. Essentially, it allows you to "train" your followers in skills you have a rank in (expert or master). Basically, your followers get a rank 1 level below yours in any skills you both have trained.
Example: I have the educator background and am a Melee Expert. All of my followers who have any ranks in the melee skill (which is pretty much all of the followers in the game) are now Apprentices. If I become the Melee Master, they would become Experts. This does not cost gold.
The trade-off is, you get one less follower. Probably worth it if you plan on having your followers attack/are picking up melee ones for backup. Outside Dodge and Melee, however, you get less utility out of that background. It is pretty cool, however, especially if you're roleplaying a professorial type (magic or tech).
To my knowledge, there is no way to influence a follower's skills/spells/etc outside using a hack program of some kind.
PS: A random tip for beginners. XP gain in this game is tied pretty directly to damage YOU deal. This can be damage dealt through guns, magic, swords, or even traps; but not followers or summons (i'm pretty sure about the summons, definite about the followers). So, the easiest path through the game (at first) is a pure melee build in turn-based mode. You can go tech for Charged Rings or magic for all the random magic loot drops; charisma and persuade are also fun to add in.