Read The Joy of Living: Unlocking the Secret and Science of Happiness by Yongey Mingyur Rinpoche. It will answer all your questions about meditation, how and why it works, what method is the best for you, etc. You can buy it here.
You can change methods every day if you get bored from one. You can meditate alone or with a group of people. Just relax and enjoy it without waiting for any huge results. In some time you will feel the difference between you before and now.
All methods give the same result in the end. You just need to choose every day the one that you like the most. This way you won't get bored with meditation and will be glad to practice different methods every day.
Meditation works slowly but amazingly. There is no method that would give you huge results in a week of practice. But they all will give you amazing effect if you practice regularly for a long time.
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