Joe's advice it very sound - unless an artist is A. your friend or B. very very into your story... you're not going to find anyone who will work for free. After all if they want to make a comic for no immediate pay that will later be put on patreon they can make their own.
Make it a written story, and maybe when you've got money to hire an artist it can be a comic. It's best to pay artists in general. Nobody should ever work for free.