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Snap a chalk line along where your wall will go (Image 1), checking square before you snap.
Tip: It is a good idea with this type of project to create some type of a mockup (cardboard or plywood) to help visualize the dimensions.
Measure from the chalk line to the stud (Image 2). Make marks on the stud where your frame will sit.
Set your mock 2” x 4” into place, checking plumb and level as you place it. Mark the slope of the stud on your 2” x 4.”
Cut a bottom plate and a top plate to length, and using your 2” x 4” as a guide, cut studs with the same angle.