It seems like you got your blog up and running – congratulations! About the “WebPage not available” – this is a common thing. Just wait a few hours, clear your browser cookies and you should be able to see your blog. If you want to speed up the process, follow this guide: http://support.hostgator.com/articles/hosting-guide/lets-get-started/when-will-my-domain-start-working-propagation
Selling private ads can come in the form of banners, buttons, or links. You can even make money writing sponsored posts where you write about or give a review of an advertiser’s product or service. Another option is to write an underwritten post or series, which is where you can write about any topic, but the advertiser pays for a “Brought to you by” mention in the content.