If he chose to go into blogging I beleive that the first thing is for him to be ready to sacrifice his time and effort towards work,am a blogger its not always been easy for me when I get started,from advertising,blog updating and constant observation from those blogg and its traffic/impression so its not always easy but with time you will enjoy that profession (blogging)Those are great ways to earn good money online. But you can also earn a meaningful amount of money through blogging. Just give it a trial.