And maybe you don't need to start from scratch -- don't you already have some places online where you tend to go, or have made some sort of nook or cranny for yourself? Most online services offer some kind of "hub" where you can pull "yourself" together; Google has your Google+ profile page; Yahoo! offers MyYahoo!; and of course Facebook offers the ever-changing format of one's Facebook Profile page. Beyond these major players, dozens of services will enable you to cobble together a personal web page (no coding required! they say), or you can get a slightly higher level of service with a paid home, which can come with domain and/or hosting services, using one of the big providers such as GoDaddy. At the top of the cost list, you could register a custom domain name, using some version of your own name or a phrase you've chosen, and hire a web designer to put together something more singular for a few hundred dollars.
But a true online home is more than that, I'm willing to bet. Home is a place where no-one but you re-arranges the furniture. A place where friends, but not trolls, come to visit. A place where services and media you really enjoy and have chosen -- your books, your films, your e-mail -- are near at hand, and free of advertising. And a place "near" to other places, other friends' home, where you like to go. And, in the cacophonous world of the Internet today, it's getting a bit harder to find.