I dont want to be discourageos but at least take a part time job .Why ? Because internet marketing its very hard in the begining and if its your only source of income you can have a huge disapointment if you need to pay bills ,live with that money etc . Take a job and work in this free days in internet marketing ,with a job you have a source of income plus you have a some income to spend on your traffic sources ,email provider etc
It might even make more sense to have a full time job and start your IM career on a part-time basis. When your IM career is working out, you can then pick the best time to switch and make it your fulltime effort and the "day job" a part-time one. This approach will probably work best from a cash flow perspective.
Fundamentally I can agree with what you have written. However there are some exceptions to your advice. For example one of my tenants is a woman who because of health issues, is a shut in who receives a government pension. She buys and sells stuff online and makes extra income this way. She has the time to do this and it keeps her busy while lining her purse.
Your tenant has a backup income and isn't cutting herself off from that income while she builds up her online cashflow. Most of the people who think they can plunge into instant online riches don't have a backup income.