Algebra 1 Practice Equations Creator

I need someone to create Algebra 1 practice equations with answer keys in PDF format. At the beginning of each Algebra 1 topic, please show how to solve the equations step-by-step. I am interested in having video with audio formats submitted as well showing step-by-step equation solving for students who prefer learning by demonstration to enhance understanding. Just one example per equation type is needed. Everything MUST be able to be used commercially to be used on Amazon. I will need any of the source files used as well. After I accept the project, I will need to reach back out and add a page to lead people to leave a review on Amazon. The ideal candidate will have experience in creating educational content and a strong grasp of algebra concepts.