Social Media Content Creator and Manager

I am looking for help marketing my law firm to clients across the country. To date, we've primarily relied on LinkedIn for social media marketing, but we are open to new ideas. Our firm helps commercial property owners understand whether their real estate assets are reasonably valued by government assessors (in Ohio, the County Auditor sets real estate values). We need help creating professional looking content, creating a content calendar, and converting possible post ideas from people in the firm into actual posts. I want a consistent, professional, and friendly voice and "look." We do most of our work in PA, OH, and Illinois, but we also have cases in many other states. I think we need up to 5 hours a week worth of help right now, but if you have good results and good ideas, and can help in other marketing efforts, that could grow. For instance, we've experimented with online advertising on Google with a marketing company.