Affiliate Marketing Secrets

I am looking for a legitimate way to supplement my income to afford college tuition and groceries and rent. All I can find are scams and sites where they want $47-97 to join then want me buy extras. Upon research I have found that a vast majority are just scams.
Are there any good ways to make a decent living, at least a part-time job worth of pay? Besides selling on eBay, I already have made any money I can from it and it wasn’t enough.
Is there any ways I can legitimately earn money online with out huge start up costs or a month of training? I need the money fast, however I don’t need to earn over a thousand dollars a week. My primary job at a Kroger has cut my hours to part-time and I never know whether I work days or evenings so I have been unable to find a second job. I am just looking for an extra $300-500 a week.
Please don’t reply with any scams. Feel free to use affiliate links, however, know that I will be doing very in depth research on any products posted.
Thanks.

I’m ready to learn and do what ever needed to start my own business. I just want to know how. Last few days besides job I spend of thinking what kind of business I want. I understand that I want financial Independence and for me its doesn’t really matters in witch niche to start.
I have no lots of money so any possible cheap business is fine with me. I just want to spend my time for better future for me and my family. That is my motivation. I want to be a better man.
I looked for possibilities to earn from offline affiliate, my plan was to advertise trough flyers in the evenings but I didn’t find anything that would work. Or maybe I’m just too scared to try.
So if you have any information where i could find usefull information or motivation for start, please share you’re knowledge.
Great would be to know some schemes that work that would help me to rise funds for better businees.