As for the models on the client, you identify the model code for the race/gender model you are trying to add, identify a source file containing that model, and add an entry to the zone's ShortName_chr.txt file.
Example: southro_chr.txt
Code:
2
ork,ork
kob,steamfont_chr
This reference can help:
http://eqemulator.net/forums/showthread.php?t=28639