To keep an outside wall plumb in strong winds, you should add extra bracing. For most walls, a single brace will do, but if it’s longer than 25 feet, install two braces at opposite angles.
One method uses dadoed 1x6s. First frame the wall on the ground normally, then eyeball it and get it relatively square. Now, lay a long 1×6 across the wall at roughly 45 degrees. The brace should begin in the bottom plate between two studs and terminate in the top plate between two studs. (For an 8 ft. wall a 12′ 1×6″, #2 grade or better should be good.)
Nail the brace in place at either end, leaving the nails protruding so you can remove them easily. Set your circular saw blade depth to 1 3/4″, and use the brace as a guide to cut 1″-deep kerfs across each stud and the plates. Then lift off the brace, and finish cutting your dadoes by cutting a number of 1″ kerfs across the stud, and knocking out the wood with a hammer or chisel.
Now cut the brace about 1/2″ short of the top of the wall. This allows you to adjust the wall for plumb when it’s upright, without worrying about having to trim excess off the top. Nail a couple of nails at the bottom plate, and a couple in the first stud. Start nails at each stud. Raise the wall, adjust it for plumb, and drive the remaining nails home.
Metal braces are easier: a single kerf along the studs is all it takes. Easiest of all — though more expensive — is plywood sheathing. You don’t need to sheath the while building; a sheet on either end of exterior walls will do the trick.