Making a great looking responsive website is only half the battle. You will need to make the website work hard day and night to bring in the revenue to pay for itself. With a responsive WordPress website the inbuilt Content Management system is a very good place to start.
Security is always a big issue when you have an online presence. WordPress is no exception. Along with a good backup routine and maintaining a healthy plugin directory you always want to make sure your WordPress site as a strong username & Password.