It's simple. Follow the breath.
Calms the mind
Relaxes the nervous system
Helps you to tap in
Find a comfortable seat
Keep the eyes closed or look down the nose
Focus all of your attention on the mindfulness of breathing, paying close attention to the inside of the nostrils, the tip of the nose, and the top rim of the upper lip.
You may consider qualities of the breath, such as depth or temperature, but try to maintain equanimity or non-judgement over what you observe.
As distractions or thoughts arise, simply return the attention to following the breath.
Remain for 5 minutes or more. 20 minutes is ideal to take the mind into deep meditative states.