Getting a Domain Name

I'm posting very late tonight, was thinking of posting in Watery Wednesday but I think it's too late. Been a long day today, early start as well. My MIL and I went to my SIL in Medway, Rochester (an hour travel from Canterbury) to do baby sitting with the 2 girls cos my SIL had a school conference (she's a primary teacher) for the start of term. We left here 7 am and came back 6:30 pm already that's why I am late blogging world! Anyways I am thinking of getting my domain name soon. Been thinking of this last week, yes my blog isn't earning yet and would really want to. I've been reading about google adsense and things like that, trying to research and know more about domain names, the benefits of it, how to get it in cheapest possible.Like what's the considerable or fair amount of a domain name?  I don't wanna make a step too soon without having enough knowledge about such matter, and there is some thing I need to earn first, like more followers, traffic, and more about blogging I guess. And oh I don't have paypal account yet, that's what puts me off getting domain name as well. I need your help my blogger friends, could you give me any advice, suggestions or any things to consider in getting domain name? I would really appreciate any suggestions from you guys! Help me build a name and something valuable in blogging world whilst have no work. =)  Good night! Hope to get some suggestions here tomorrow!hehe..Thanks in advance!