Now that you have created your blog you have to decide if you want a free account or to host your blog on your own domain.There are lots of free hosting available on the net if you do a search.f you have a budget it's best to have a domain that ends with a .com and the cheapest one is here.But if you are just starting out and still trying to figure out how this all works then you can get a domain that ends with a .info for just 0.89 cents here.www.GoDaddy.com
If it's possible it's best to use .com because thats what most people will go to.As for domain names try to keep it short,simple,easy to remember and related to your topic or business.Now for a free domain name go here and if you are trying to build a website go here where you can try to build a website for free and they even host it for you for free