I have been fairly negative in my two replies above so here is a more positive one to help you on your way
1) First you need to buy a DOMAIN NAME. This is the name of your web site (www.myauction.com or whatever). This will only cost you a few pounds a year. You order one via any ISPs web site, say 1&1 (but there are others).
This is where you do it on the 1&1 web site.
http://tinyurl.com/yfo929m
2) Then you need to find someone to HOST your site. You can use any ISP, such as 1&1 (again there are others). You do it here:
http://tinyurl.com/ylewpun
The cost can vary depending what type of hosting you want.
Buying a domain AND getting them to host it can be done totally via the companies web site and there is no need to email anyone or phone anyone up.
I created a web site and did it all via the one companies web site. It is very easy to do.
continued....