Please web masters in the house please help me am a newbie

Bro your question is not clear but if you meaning buying damin you can buy from any webhosting company of your choice like web4africa godaddy etc but if you are asking how to chose the best domain for your blog then consider this:

1. Make it short, simple and easily to remember so that your follows don't suffer to remember your website.
2. i still prefer a domain with a .com extension because is widely used and easy to remember

Remember some webhosting company offer free domain when you pay for webhosting plan from them if not a domain will cost you anything from 1000-2500 naira for one year.

If you have any other question feel free to ask.