"Mods" is slightly ambiguous. It sounds like you'll be drawing hairstyles and sharing
charCodes (character-configuration strings generated by in-game customization). But those are not the only aspects of a character; you might also like to try drawing custom clothing, or writing dialogues. You could also try to rig up some fancy new
sexual positions for your characters to use.
You might decide to start by editing someone else's work instead of drawing on a blank template/canvas. If you do so, please remember to
ask permission from the original artist before sharing your work (and then credit them in the finished product). There are a few artists (e.g.
Dante) who have
explicitly shared their source files and granted advance permission for derivative works. Most artists release their work in a ready-to-use format (such as PNG or SWF), which can be tricky to dissect or edit. If you'd like to modify one of those files, then contact the artist -- most will happily share their work with a novice in order to help them learn, so long as you ask politely.
You
won't get punished (e.g. banned from the website) if you forget to credit an artist. We'll happily overlook a few newbie errors. It's just that if you do it persistently then artists may dislike you, which limits your ability to collaborate with them or seek their assistance on difficult projects.
If you're drawing your own stuff from scratch then there are few rules or restrictions to worry about. Just the
general website rules and forum etiquette such as
"don't start flamewars" and
"don't resurrect an ancient thread unless you're adding something really important." If you'd like to share your work via a forum thread (e.g. file attachments, download links, spoiler tags) then that's fine. If you'd like to publish your work via the
Resource Manager then I can walk you through the process.