Walk in wardrobe

I have a half cupboard with full door and stud wall on right, 118cm deep. To the right an alcove 120cm wide. I want to knock the stud wall down and extend current half cupboard into the alcove and move the door to the right. Then where door was put wooden supports behind, plaster board. But so wood behind could take tv bracket. Then in the walk in wardrobe kit out as per spec. Also need the loft boarding.