Reiki is a subject that google would have turned up more results than you would have been able to read. Its hard to tell if your being serious but I'll write out an answer here anyway.
Reiki is made of two Japanese words - Rei which means "God's Wisdom or the Higher Power" and Ki which is "life force energy".
(From Reiki.org)
While I have heard stories of Reiki working well on physical wounds in my experience it has had mostly energetic/psychological effects.
Yes, I'd say that while it will work on your body it has its best effects on your energy and mental health.
You could start practice by joining any number of yahoo groups where the attunements and classes are given out free daily.
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