One of the first things that you need to do as an author is get up your author website. This is something that can easily be done all on your own, even if you do not have any website building experience. In fact, you can find an easy to follow guide online here. As the guide tells you, getting your own author website will end up costing you somewhere around $100 or so total.
What you should not do is use a free blogspot.com address from Google or another free website. You should also avoid using Facebook, Twitter or another social media account as your own web presence.
You should strive to look like a professional author, because that is what you are. Professional authors have their own websites in addition to all the social media profiles.