I'm a graduated student and about to make a poster for my institution's conference. I would like to have a website so that I can have more space to present in the poster while still have a data to show if necessary. If I choose to have a free domain, I will have an URL contain the host name, e.g. myname.wordpress.com. If I buy a domain and use free host like Wordpress, I can quickly build my website up but the price is not cheap. If I buy a domain and a host, the price may cheaper but I have to build it by myself. I want my website to look professional (and impressive) on the poster so that using a free domain may not a good choice, but I also consider in the economic prospect. In my country, $10 is not a big deal, but also not a thing that people is willing to spent easily.
If your department/school won't give you support...
The domain should cost you between $0.50 to $0.99 USD for the first year. Hosting costs range a lot, but many offer deals for the first year that cost about $12 USD.
After you have your own server and domain, it is trivial to setup WordPress on your own server.
Thus you get the best of both worlds, extremely affordable and easy! Besides, I recommend most people have their own personal website for their portfolio and such anyway.
I'd recommend Github pages as a quick and easy way to set up an accompanying static site without paying for hosting. For free you get a slightly nicer sub-domain than wordpress etc. (
username.github.io), or if you've bought a custom domain you can use that. There's some nice, modern default themes and Jekyll integration if it's to be used as a blogging platform.
I would simply walk off a poster without asking for a copy of the paper if the poster had a WordPress reference for the contact information. To me, this makes a statement to the effect of "I am an amateur and don't really know if I want to be a part of academia".
There is no shortage of professional social networks, including LinkedIn (academia + real world), ResearchGate (academia as a whole), WebMD (medical sciences), and whatever it might be in your discipline. You can start off with these. Also, I am surprised that you can't set up a personal page at your institution, even as a graduate; this would be the primary route in the U.S., as far as I can tell.
The best thing to do in terms of web presents at this point in your career is probably to host it through your institution. Pretty much any academic institution has some way for its members to host a website, and will sometimes provide templates as well. Talk to your IT staff and find out what they recommend.
If hosting through your institution is not possible, you can also consider using ResearchGate as your official web presence. It is designed as a social network for academics, and gives a nice stable URL as https://www.researchgate.net/profile/[yournamehere]