Why do you want to do this work? It seems outside of your skillset and wordpress is a technology that is notoriously cheap to get develop for. If you're just

Why do you want to do this work? It seems outside of your skillset and wordpress is a technology that is notoriously cheap to get develop for. If you're just doing a friend a favor and picking up a little extra cash I'd charge $50/hr and let him know you're doing it at a family and friends rate and set his expectations accordingly. If you're trying to break into freelancing I'd just not do it and spend the time reaching out to people who have problems they'd be happy to spend 125-150/hr fixing from someone who works for a big 5 tech company.