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Entheesa so the more you turn over soil the more of the nutrients you lose, plus more chance for weed seeds to get into the turned soil and sprout into weeds. So the Idea is to keep the soil as settled as possible and to avoid digging it as much as possible. It also helps disturbing all the little bugs that are doing their important work in the soil..
So the cardboard on the top will suppress the weeds that are already there. You do need to give it a good dig out prior to doing this, just to remove any last bits. Then your soil on top is what you plant into.
You may want to leave some gaps in the cardboard if your planning on planting any shrubs or pre potted plants. But apart from that you should just be able to sow your seeds direct on the new top soil.
If you get self seeding plants/ perennials you probably wont Need to replant the patch every year and hopefully it should bloom year after year. You may just need to take out small weeds, but you can do that localised to the area you are we’d in without moving too much of the other soil.
If you need any help I love gardening I can give you some further advice
