You are not purchasing a web site! You are registering a domain name and server space, upon which you can build many other web sites, amongst other things. Therefore, you need a domain name that will continue to work for you after this semester is finished, maybe even after you have graduated from Emory.
The preference is for your domain to be some version of your name (i.e., janestudent.net or davidmorgen.org or johndoe.com) but if you have a very common name you might have to be a little creative.
It is also perfectly acceptable for your domain name to be a short word or phrase that is easy to remember and spell, and which speaks to some interest of yours or an aspect of your character (i.e., my friend Audrey Watters publishes a site called hackeducation.com; Kin Lane spends his careers working with APIs and his domain is apievangelist.com; or Tanine Allison, a professor of Media Studies here at Emory who is finishing her first book entitled Destructive Sublime: World War II in American Media, uses destructivesublime.com as her domain name; or one of my favorite art and design blogs, which is called thisiscolossal.com). If you’re going to choose a title or phrase as your domain name, make sure you think about it very carefully so you don’t show up on one of those lists of the most unfortunate domain names ever, like the design firm called Speed of Art that ended up with a domain name that sounds like it’s about flatulence in a swimsuit.
Do not include the word “emory” in your domain name. The university brand management office is quite emphatic about trying to keep domains including “emory” only for official university sites.
Do not include my class name or something specific about a course, or even your major, in your domain name. You will add subdomains or pages of your sites that are specific to classes, but your primary domain name should be something that can grow with you.