Techniques to help calm and focus your mind toward mindfulness include following your breath, counting your breath, visualizing, relaxing, or focusing on a visual point (such as a mandala) or a sound (such as a mantra).
Many religious, philosophical, and spiritual traditions throughout the world use different meditation techniques, and all of them may be useful for quieting mental clamor.
Kinhin is the walking counterpart to zazen.
Eventually, you will be able to sit in awareness without techniques and then carry that awareness throughout the day.