Some folks prefer a mentor/mentee relationship, where the "master" SEO copywriter reviews your work, answers your questions and helps you learn the art faster and easier. Some mentors will work with writers for free -- but that means you'll probably be paying in other ways (such as helping your mentor with tasks.) Other people will charge money. Although "free" is a great price, don't reject a paid mentor relationship if you have the funds available. You'll probably be able to work with an SEO copywriter faster (and receive more consistent feedback) if you're able to pay.