natural dye fabric

I really want to get onto this natural fabric dye boat 🌾 🌰🌻🌿🍆🍁🍂

But every article suggests a different method. And I just want to do it right, on my first attempt. I feel so confused and overwhelmed D:

I have a white, full cotton, mori kei-ish dress. It would be perfect for my first project. And I just don’t want to fuck it up TTATT