When it comes to getting paid from your blog you have one or two choices, the two main options are with affiliate marketing and Google Adsense. Affiliate marketing is an enterprize model where you join up to become an associate, freely for a certain product, publicize that product on your blog, and when someone buys that product or service from the unique URL of your website (which may have your unique affiliate id embedded in it) you will make some money.
Google Adsense is a method where you permit Google to place ads on your blog, adverts that are related to the subject of your blog, when someone clicks on one of the ads you will earn a commission. With adsense the amount you make per click can change seriously based on the acclaim (and so the amount of money advertisers are ready to spend to place the ad) of a certain subject. The more popular the niche you are in, the more advertisers will spend on the adverts and the more you’ll make when someone clicks on those adverts.
Don’t let the unfamiliarity with others scare you off of learning how to blog for money.