I was wondering if there is a stander way of making sigils or if I can create my own. If I do is the intent enough to charge them?
You can make it however you feel like it.
The many ways that you can create and use a sigil is up to the magician and your experience and experimentation to focus on your goals and ritual.
The letter elimination method is the simplest way to make a sigil. The more specific the intent the better. Mastering the art of how to make a sigil properly comes with experience. I like working with paper and a pencil that way you can easily make corrections or changes, however you can experiment with other methods. Digital art, paints, collage, ink pens, can all make excellent sigil mediums.