A simple meditation practice should be like this:

1. Sit comfortably. Your back should neither be so straight, nor it should lounge. Just get a nutral position.
2. Calm down your legs first. Remove any tension within them.
3. Calm down your arms. Situate your upper arms parallel to your upper body. Rest the palms of your hands on your legs wherever it feels most natural.
4. Soften your gaze. Slowly soften your gaze, and close your eyes.
5. Feel your breathe. Feel that warm air going inside your body, and coming out. 
6. When mind wanders, peacefully return to your breathe.

Start by doing this for 10 minutes daily.