And because you have no money to start with, you could sell some old stuff and might find a collector. Actually that is how it all started. Have a look at wikipedia and learn about the history of one of the biggest success stories in the internet.
If you have no old stuff to sell, because all things were taken by typhoon ondoy, you could go to the next store, look for ONE item you think would sell well, calculate your prise and try to sell it.
If you could not sell it, you got some experience! and might be more successful the next time. What I meant was, you do not need to sell your own stuff, you also can sell for a commission. Actually in Ebay you bid and you win then you pay and after that you get the stuff.
In Ebay you can buy and sell a huge range of items. Have a look!
This means you can sell collectibles, antiques, your old computer or cell or brand new stuff.
And what do you need? you need an account by ebay - you need to register, and you need a means to pay and get payment. I suggest Paypal but for local deals smarmoney or Gcash are a better means. You also need to deliver your goods which means you need to pack and post it.