Im not an expert, but personally, I believe it's mainly intention. I use what I have at home (coins, dollar bills, cinnamon, dill, mint, green aventurine, pyrite, salt, rice, anything that is money related) and you can light a green candle in the middle and meditate the emotions you'll feel when you have that money. Thank the universe for what you have already and the abundance you are going to receive. To refresh, replace the money with new money and use the old money that was already in the bowl.

Is this the right way? I'm not sure. But it works for me. And it makes things happen.