The first principle in devotional service is to chant the Hare Krishna maha-mantra (maha means “great”; mantra means “sound that liberates the mind from ignorance”).
Hare Krishna Hare Krishna Krishna Krishna Hare Hare
Hare Rama Hare Rama Rama Rama Hare Hare
You can chant these holy names of the Lord anywhere and at any time, but it is best to set a specific time of the day to regularly chant. Early morning hours are ideal.