Lovely and easy to set one up: try wordpress[/url], blogger (other blogging software is available…) for 5 minute start ups.
Can be free if you're happy with your blog being WHATVER-YOU-WANT.wordpress.com or WHATEVER-YOU-WANT.blogspot.com. It'll cost you to buy and host your own domain name, not a lot usually, but a bit, should you want something without advertising who it is that makes the software for your blog (like my site, for example)
Anything else? Erm…like everyone above has said, it'll flop on it's arse if you're dull. I don't mean 'dull' as in 'you're not a multi-millionaire spending all his dosh on hookers and holidays and blogging about it', everyday stuff can be interesting if you've a good way of describing it.
Samuri's[/url] blog is ace, even when he's just talking about a short road ride where some fool dared to get in his way, for example.
Apart from that, do what you like, some people'll probably like it, some will hate it and some won't give a toss either way, it's all good 🙂