Be comfortable in a quiet place. Find a quiet place where you won't be disturbed. To get started, it doesn't matter whether you sit or lay down as long as you are comfortable. You can sit cross-legged, on the floor, or on a chair. If you can sit erect, then great. If not, it's just important to have your body in a somewhat stable position. Then have the palms of your hands face the sky.
Focus on your breath. As you take long and deep breaths, feel your breath move from your lungs and out through your nostrils or your throat. (Breathing through your nostrils is better though either will work). Your mind will wonder (which is okay), just try your best to be as focused as possible.
Feel your body. Once you're focused, take notice of your body and how each body part feels. Start with the toes and work your way up to your head. If your mind continues to wonder then bring your thoughts back to your breath. Breath 5 to 10 times with full concentration on each breath. Take it a step further and hum "Om" as you breathe out.
Practice! Like anything, practice makes perfect. Make sure to carve out a time each and every day to practice. You'll hopefully find all your practice totally worth it as meditation can be life-changing!