Step1. The very first step should be, put your apple watch on your wrist. and adjust the band according to your wrist size.
Step 2. Turn on your apple watch and bring your phone near your apple watch.
Step 3. Here you will see an option named setup for myself click on that.
Step 4. position your iPhone so that your apple watch appears in the viewer find them in the Apple Watch app this pairs youR both devices.
Step 5. The very last step is to tap setup apple watch then follow the onscreen instructions to finish up the setup