Professional Blogger

I was watching TV the other day and they were talking about a professional blogger named "Perez Hilton". How does one become a professional blogger? How many blogs do you need to write to be considered a professional? How do you get paid to be a professional blogger. I have written 3 blogs and have not received a penny. Do you need a degree in blogging? I have been looking for a part-time job and have never seen an ad for a blogger. And where did the word blogging come from? Someone had to make up the name -- who did it? I need answers.