IDS Signature Training?

Yo...
I thought I was good at "Googling" but I can't seem to find many sources about creating IDS signatures.
I know it's different, depending on the product, but does anyone have any articles, video lessons, or some sort of training for this sort of thing?
I think it's something I can learn to add to my arsenal.
Cheers!
Edit: I've found more by searching for Intrusion Detection System rather than IDS
. Still looking for something good, though.
I thought I was good at "Googling" but I can't seem to find many sources about creating IDS signatures.
I know it's different, depending on the product, but does anyone have any articles, video lessons, or some sort of training for this sort of thing?
I think it's something I can learn to add to my arsenal.
Cheers!
Edit: I've found more by searching for Intrusion Detection System rather than IDS

Comments
https://community.mcafee.com/t5/Documents/McAfee-IPS-How-to-write-a-custom-signature-UDS/ta-p/552039
https://www.youtube.com/watch?v=ww9WdyWs3yI
Custom Application & IPS Signatures
This is a good start and shows me where to go with it.