I started by going to a group once a week for first three week. It cost £7 a session which I think its abit steep. I know these people want to make abit of money but the person who did the sessions hardly lived in a crap house and was poor or struggling. Anyhow, go to a few paid sessions if you can just to get an idea of what its about. Dont expect to clear your mind till you've been meditating awhile during the session, as in you will start and relax and find your mind is full of random thoughts. Dont worry thats normal, it will start to clear abit more and more the longer you meditate for. It takes time.
I started doing meditation for ten mins a day. Best to start small and build it up. I plan to go up to 20 mins a day. It can be quite boring at first, hence why I started on just 10 mins so I can get used to it and build it up. Find a time and place where you wont be disturbed. If there is any kind of noise, accept the noise and hopefully it will go(the source of noise) and you can just move on from it in your thoughts. If there is a constant source of noise that will be distracting then pick a time when its going to be quiet.
Focus on your breathing, slower but natural breathing through the nose. Listen to the sound of your breathing through your nose and try to concentrate on how the breath feels as it passes in and then out through your nostrils. Try to be soft in your breathing but as you first begin take in deliberate, slow long breathes through your nose, count to ten in your mind on each breath and then go into a normal pattern of soft, breathing. Focus on your lungs inflating and then deflating, or on your navel and abdomen rising and falling with each breath.
Oh I forgot, sit upright when meditating prefably with your back against the wall, cross legged with your right foot placed on your left calf and your hands placed either palm down, relaxed on each knee or hands facing upwards and your thumb and first finger touching at the tips in the classic meditating posture. Make sure you are comfortable.