Hello,
first the disclaimer, as this is important. I'm not a professional and my articles shall be taken as they are, they are not investment advise as it can go wrong for your from different aspects that I'm not aware.
Inspired by 
Here if I go around, I might get some empty bottles which than can be exchanged for cash at the supermarket.
So my challenge will be to start with no money and will try to build a side gig which will grow a budget that I can invest in one year in something that makes money without to much work.
I will start with free stuff that people post on ebay and try to sell it for a profit after I do clean it or change it somehow.
I know, you might say if people gave it for free, give it also for free. I don't think this is the right approach because I think I help the people who are giving up stuff for free, they need it gone and I solve their problem. Try to think of yourself as a problem solver for others.
So, like said I will start with free stuff that can be sold, moving towards to more expensive stuff that is available and which can be flipped for a higher margin.
So next week I will come up with the progress and what I took from ebay and was sold, if something was sold.
Do you have a side hustle? If yes, please describe it.