Online is very powerful, from our perspective.  We have lived and breathed it for over 25 years.  If you new to online, you may want to approach it as side income, part-time income or secondary income.  But you have to be committed to this secondary income – treat it seriously and give it the necessary attention.
There are 24 hours in a day – you can create a full-time income (second income) while holding down a full-time job.  You just need to set aside all the extra stuff.