Starcraft/Broodwar editing

Does anyone know where I can find a detailed and/or very good explanation on how to edit starcraft/broodwar. I have searched the net from top to bottom and every tutorial i find seems to tell me how to do this and how to do that......but doesnt explain what everything does. If I knew what i was working with or what the object did, then i might be able to handle it.

I currently have this software: STARDRAFT, STARGRAFT, ICE, RETROGRP, ARSENAL III, and and assortment of others.


I want to:

ADD NEW UNITS
CREATE NEW UNITS FROM OLD ONES
CHANGE/ADD BUTTONS and their PICTURES
CHANGE UNIT PORTRAITS
CHANGE DEPENDENCIES
etc


Please help