Hi! I just want to put in my 2 cents:
Blogger is easy. Wordpress is also easy. Momma L is incorrect - wordpress can be free too, but if you go the "paid" route (paying $5-10 per month for your own domain name), you will get more readers (I'm not sure why but you will). On Blogger, it is free, but you can pay for your own domain name for just $10 a year, but you won't have as many page views.
And, one other thing, to get income online, it's like a normal job. Expect to work at it HOURS AND HOURS a day. If you want to just share knowledge and help people live healthier, then just focus on that and people will come to you. Be authentic, because if you try to be something you're not, readers will see right through that and go somewhere else for their online reading. Just think before hand why you want to start a blog and have realistic expectations about how much work you'll have to put in on it. I blog for enjoyment and love meeting people. Making money would be awesome, but for me, it's not worth the time I would have to give up with my family in order to make a few dollars.
I have been blogging for 2 years now and I'm JUST NOW starting to get some free products but still no income. Blogging isn't a secret way to make money, like some people may think. I'd say just do what you do best and enjoy your writing.
Wordpress is considered more "professional" and making the switch later can be complicated. If you think you might be blogging for the long run, I'd suggest starting on a free Wordpress blog, and later paying for it once you have a large readership.
Free Wordpress blogs: http://en.wordpress.com/features/
Good Luck!
G.
http://www.texanmama.com