Okay so this is how to create custom start areas.
(I use HeidiSQL so if anything is different with navicat I wouldn't know.)
1. Go to the position you want the character to start.
2. Type .gps, this should bring up alot of numbers right them down or put WoW in windowed mode. (Unless you have a really good memory)
3. Log into you're database and go to the table playercreateinfo and press data if you're using HeidiSQL
4. Replace MapID, ZoneID, PositionX, PositionY, PositionZ for EVERY row with your .gps amounts.
-I suggest you use this tactic: You copy the X amount and paste it in every rows X slot.. and do this for every slot you need to replace.
5. Then restart you're server and tada you have a new start zone.