Mike, I suggest you read this page https://forum.charlesdowding.co.uk/no-dig-growing/no-dig-growing-preparation/ so as to understand better what you are doing.
Going back to your original Q, it could save you a lot of money.
If there are weeds, that is where the cardboard is an excellent mulch, but I urge you to study the details before committing a lot of time, money and materials.
