If you google "free online advertising," there are so many avenues you can choose from such as submitting the url of your blog at ping sites, you can advertise in the free ad sections of some directories, you can also advertise in classified sections for free. You can write articles and submit to various forums and you could even advertise in the free section of your local paper if they let you.
Do not pay for people to click on your page as you will get people clicking and you will notice your traffic data going up as they have to be there for a minimum length of time but no-one will be on there reading your blog. They are hired by the some companies and asked to click on a link for a cent. Its hardly worth your time or theirs.