I've had several solopreneur projects that needed website. Started by learning about WordPress and buying a theme, etc. Even though I am familiar with computers and created 2-3 websites like that, I just couldn't keep up with all the plug-ins and it was getting hit all the time with people trying to hack my website (even non-commerce sites). It took me days to figure out and my alternative was an acquaintance would have built me one for $3000 + plus monthly hosting fees.
I finally switched to Squarespace. I put up a website within in a day, learned a few more things and added a commerce section later and sell my products there. Right now, you'll pay $14/month for them to host it -- but they take care of things like updates, security, etc. People who make websites for a living will tell you that WordPress is easy (I'm sure it is easy, for them) and that sites like Squarespace and Wix don't load as fast or they don't help your SEO as much ... and all of those things may be true. But you're looking for a website for a book that won't be done for 3 years - so what you want is fast, reasonably cheap, and looks pretty good. For me, it is the perfect middle path between paying someone to make it (way more than the site is worth to me) and going fully on my own and trying to figure out and stay on top of WP.