Hi I've just started messing around with private servers and i just brought my own up, I was messing around in the DB when i figured out how to change races. It's quite simple all you need to do is go to the table Playercreateinfo and scroll side ways to DisplayID. To find out what race is what ill give you the race numbers; Humans are 1, Orcs are 2, Dawrves are 3, Night Elves are 4, Undead are 5, Tauren are 6, Gnomes are 7, Trolls are 8, then there is no 9,
and Blood Elves are 10 , and Draenei are 11. To change the appearence just put the Display ID of what you want into DisplayID (if you don't know thats the morph id). I got the ID's for Goblins and Murlocs;
20582 Goblin Male, 20583 Goblin Female, 441 Murlocs, and i also found the ID's for some Naga but its only shoulder pads and they have an illidari tabard; 21159 and 21160.
As for Changing the Zone, look at the colums before DisplayID and there should be Map, Zone, Y, X, Z. As different rows each, but go to where you want to have the race start and type .gps it should give you the coords to fill that out plus orientation which you won't need.
Thanks for reading my guide