Modern life more or less requires some level of electronic engagement, even if it’s just a cell phone. I’m usually the odd man out in a group in that I don’t have one. I have a laptop and an old laptop that’d work if I just got a charger and a Wii and a Kobo Vox, but I’m still cell phone free (I make up for this by nearly constantly being on my laptop and having a Skype number). Most cell phones now come with the ability to browse the web – thus the rise of QR codes. Which means that even ads on the sides of busses now have an online component.
This is a long lead-up to tell you that, if you are an author, you need a website.
They’re not hard to set up – WordPress.com and Blogger both have easily navigable back-ends. They both make excellent blog platforms, but it you have no wish to blog, then you can set up a static site, just listing your works and where they can be purchased.
That is a bare minimum for engagement, in this modern era. Giving readers a way to contact you or interact with you is a better route: a contact email (set up a free webmail account if you don’t want it sent to your personal email), or a blog. A forum is perhaps not quite the thing unless you know there will be interaction on it, but it is an option as well.