There are different types of Buddhist meditation practice and you can apply different techniques at different times; with experience you will come to know what is appropriate for you. Below are some links to various guided meditations.
Dharmaseed — Meditation Instruction
Metta (Loving Kindness) Meditation
Metta Meditation (for Self & Benefactor)
Metta Meditation (Expanding the Field to the Neutral Person)
Guided Karuna (Compassion) Meditation — with Q&A