You would use AFTER, example;
Code:
ALTER TABLE npc_types ADD walkspeed float DEFAULT '0.67'AFTER d_meele_texture2;
this is just an Example, walkspeed is not used anymore, so if you have you can drop it;
Code:
ALTER TABLE `npc_types` DROP walkspeed;
Changes in the MySql commandline are permanent and do not ask you if you are "sure you want to do this?", so once committed, it's over and done with.
Be sure to have a backup before you start making changes.
EDIT;
Go to GeorgeS home page, he has posted a list of all these changes needed.
http://66.159.225.58/eqemu/eq.html
you can just copy/paste what you need.