I have recently added Sigils to my craft, and I must say, I am very impressed with their ease of use and potency. One attractive thing about sigils is that they do not require much energy from the crafter.
My first step in constructing a sigil is, what will it be used for? For example, say I wish it to rain today. I begin all my sigils with these opening words.., "It is my will...." Then I add the effect I require. So for example, If I wish it to rain, I will take a piece of paper and write down "It is my will that it rains today".
Then starting at the first letter, "I" in this example, you would draw a line through every subsequent "I", then move on to the next letter and do the same. So in this example you would be left with i t s m y w l h a r n o d
Then i take a piece of parchment paper and with an ink pen, write down the i then connect the t to it and so on, ending up with a pattern. You can connect letters to the end of other letters. Write a letter through the middle of a letter. Whatever is pleasing to you. The only requirements is that you form a pattern or shape of some kind and the letters are still recognizable.
Then you must charge the sigil. Their are numerous ways to do this. Some crafters use intent, others use a spell or ritual.
As you are charging the sigil, it is VERY important you keep your eyes closed. At the exact peak of your charging method, open your eyes and look at the sigil. Then IMMEDIATELY burn the sigil. You must totally forget the details of the sigil, wipe it from your mind. After the burning, I go watch a funny comedy to erase my mind. The Three Stooges works wonders for me, haha.
I hope this example inspires you to research sigils and their use in your crafting, they are a very useful tool. I have mentioned a few times in other posts, but the go-to book in my opinion for all things Sigil Magic, is Practical Sigil Magic by Frater U.D. I can not praise this book highly enough.