Place the short ends of two wood frame pieces together so they form a 90-degree angle. Lay the first one down, then line up the end of the second piece with the end of the first. The end of the first piece will make up the inside corner. Secure them to the structure and foundation with the drill and screws.
Take the first stud and place it at the end of the first frame piece so that the edges line up. It should be perpendicular to that frame piece.
Place the second stud at the end of the second wood frame piece so that the edges line up and that it is perpendicular. The second stud should create a 90-degree angle with the first stud. Secure it to the first stud using the screws and drill.
Insert insulation in the space left between the studs and along the wall, as you need it.
Attach the drywall clip to the edge of the drywall panel, then fasten the clip to the second stud to secure it in place.