The Dink Network

One of Robj's video tutorials covers how to add new graphics and what all the numbers mean. Look for the sticky post of his on the main forums, it's video #15 I believe. I'm too lazy to post a link.

EDIT: One also covers the set_sprite_info stuff as well as the NOTANIM and BLACK commands

EDIT 2: Videos 14-17 of his tutorials should cover everything you need.

EDIT 3: Link to Robj's Video Tutorial thread. Very useful for any of the basic D-modding stuff