Affiliate Marketing Secrets

I wouldn’t have a lot of time to invest in it as I’m a full-time student, but I began working at Subway almost a month ago and needless to say 40-60 bucks a week just isn’t cutting it for me. I need more money.
The only thing that came to mind is if used my free time shopping in Good Will looking for bargains and then trying to make a profit off these items on Amazon.com I’m not sure what I want my niche’ to be, or I just want to sell a bit of everything.
Honestly not sure where to begin, but I am very passionate about pursuing this because I need extra money now. Any ideas or suggestions would be greatly appreciated.

In your opinion why did it start? But please give me an answer involving Germany and Hitler. I will do best answer!

I’m 15 and I want to invest on something, how?

I have several products services and information types I would like to bring to market. I have experience in direct marketing and direct sales and wish only to transform my sales abilities to a web based [platform with minimal risk and less investment? Share your secrets with me please?

Quite simple
Just no ideas like “make a website that you are interested in or know the topic really well”.
Lastly no NICHE websites (really the same thing).
Please provide detailed information.

I want to know details about amazon affiliate marketing .