Starting with the bottom course work up with the groove facing down to ensure weather tight fit. Nail 1½" into the stud. Siding up to 6 inches wide in normal weather conditions can be toe nailed as shown in this diagram.
In vertical application, start at one corner with grooved edge toward the adjacent wall. Use a level or plumbline to ensure that the first board is installed vertically. The grooved edge of the first board may have to be trimmed to ensure a flush fit.