Sorry, you've lost me. I'm not clear what you want overall - for just using Wordpress (assuming you have some set of pages at [say, I've not searched for Wordpress] www.wordpress.com/yourname or similar) or whether that's just part of what you want.
Some domain registrations include 'web forwarding' which means someone going to exampleyourname.com could then be forwarded to www.twitter.com/somename or www.facebook.com/somename
That's the simplest, where you need no webspace of your own. Then there are hosting firms which provide just some webspace, so you'd need to do a bit of HTML to create a front page (home page) and that might link off to some Twitter/ FaceBook/ web Blog site.
Other hosting firms offer a bit more - free PHP software that can be installed via some script (so you enter a few details on a form and click, and it will do the rest behind the scenes). Things which might be included are say Photo Gallery, Blogging, Message Board (though getting combinations to work well can take some effort).
Some hosting firms offer a system tool to build your website. Firms like Heart Internet have their own, Google can offer similar (FREE!) though these "site builder" tools sometimes are restrictive over the number of styles / backgrounds / pages you can use, esp when free.
Monthly extras may be charged for some of these tools, when you really only want to design the layout once and maybe a year or two later change the design / colour scheme, etc and paying monthly for the flexibility to do that may be overkill (and costly).
Right, so what are you after with your domain?
Just a way to get to your Blog or for much more?