Usually there's a book to follow called a VMG (usually one for each dept. and also viewable from your phone if you have the link) It will have pictures of the new brand set showing the general look and where certain clothes go. Some stores may vary, but follow the map that best work with your store or ask your TL. Don't worry about it being exactly like in the picture, work with what you got.
1. Find location brand will set.
2. Place fixtures (moveable walls, tables, racks, convertibles) where they should go.
3. Remove all merch. not part of brand and move them somewhere else.
4. Put up/move around whatever fixtures to hold the clothes like shelves, waterfalls, faceouts to hold your clothes/accessories.
5. Start stocking your new brand merch.
A lot of times, you don't always have enough fixtures or space for fixtures to put your clothes according to VMG, so place it where you think looks good and makes sense.
It's also a good idea to get with your signing tm if there's any signs that should go up or down. For instance, the pink New Day banner from the ceiling should be removed.