I'm interested in starting a blog... I think. To post something to a blog is it like posting a few lines and a picture on Facebook? I just tried that and it's really easy. Is that what a blog is like? Maybe there's a link to "Blogs for Dummies" someone knows about?
I think it's of limited value; you'll have fun writing it but few will read it.
Micro-blogging (twitter, etc.) tends to be less work and gets you some measure of cred. But even then, few will read it who aren't your faithful followers, already (friends and family).
Money-making in blog-land comes in two forms, essentially: you're a popular politico/whatever and have enough traffic that you can sell banner ads; you use auto-blogging software* to build traffic for a niche audience, and then make money off of affiliate programs, selling whatever is available that will appeal to the niche audience, and which has an affiliate program (pays you a commission on the sale of the product).
*Auto populates related articles on "your" blog. Create as many blogs/URLs as there are niche markets you can identify as being of merit and potentially under-served. People make big money doing this.
My $0.02,