I do not have a server up these days...but there are a couple places in the DB you have to change the Race / Class / Deity combinations to actually enable or disable various combo's. You can even go to a third place in the db and change base starting stats...
hmm..come to think of it...if you add in a new class...say Ogre Mage...I think you have to hit that 3rd place and add in a string that enables stats for the new class. Matter of fact, now that I think about it a moment, I know you have to hit that 3rd place ...
One of those places will also allow you to change WHERE a race can start... At one point I had all my players straight up starting in the Iksar city
Sorry I can't be of more help, it has been just long enough I can not remember off the top of my head...