Buy and Sell stuff on ebay?

So i'm 15 and looking for some ways to make money, i looked into ebay a few months back and have made some from it, but i have done this by selling my old unwanted items. I don't have anythinng left worth selling now so i was wandering if it would be a good idea to go to garage sales or carboot sales and buy stuff to sell on ebay. If anyone knows what i should buy or has any other methods of buying stuff to sell on ebay please share! thanks oh and i dont have that much money that i can buy wholesale with plus i dont wannt to risk loosing my money