For Kel – and anyone else who’s interested I am faaaaaar from anything near approaching “experienced” in using sigil magic, but I have an undeniable attraction to it. Ironically enough, I was sigilising before I consciously knew what I was doing, but that stopped when my art stopped. One day we will be reunited. Until then, happy reading!
Start with Gordon @ Rune Soup’s Sigil Reboot and then move on to everything else he has written about sigils. His approach makes the most sense to me, especially with regards to not having to forget the sigil once you’ve created it.
 Go to Phil Hine’s website.  Lose the next 3 months of your life.  Profit!
Must read: Pop Magic! by Grant Morrison
Background reading – the father of modern ChM, Austin Osman Spare
Oh, if I must – TRADITION!
A folk magic approach and, in the interest of fairness, a rant
Here. Have fun.
A tutorial for creating easy sigil mandalas
Using magic squares
Gettin’ Ceremonial up in hea-yah with the Rose Cross Sigil Creator
Alternatively, use a witch’s wheel
Hazel’s elegant sigils
3-D crafted sigils by the Man in Mink
An example of sigilising, from Frater U.D.’s Practical Sigil Magic
It’s a magic binky! Sigil scarf – great for empaths/introverts/anxiety balls to wear in public
5th Aeon’s Neo-Terraphim Alphabet of Influences, based on A.O.S.’s Alphabet of Desire
Oh, the possibilities! CircleArt
Don’t forget teh lulz
You’re going to see these words a helluva lot: servitors and egregores
Leveling up – using sigils to create servitors
SIGIL ALL THE THINGS:
Basic Geometry (it’s totally Mathematical!)
Sacred Geometry (it’s totally Art!)
Robert Anton Wilson (I feel there is a strong link between quantum dynamics and ChM)
Alan Moore’s thoughts on magic (just… tie a rope around your waist before you go in)
Bindrunes (proceed with caution: runes have their own inherent magic)
Suggested supplemental reading:
And while we’re at it:
This puppy could do with a recharge