Having your images that you can use on social media is really important. You can engage a graphic designer to do this for you but you can also do it yourself. There are some excellent DIY options out there. One of my personal favourites is Canva. I use this for all sorts of things from creating Facebook cover images to creating my own memes. There is a free and paid version of this software available so check it out and get creating. I promise you will love it.
http://canva.com/