How to send effective handwritten letters to celebrities via fanmail.biz?

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Hello everyone,
I just found out about the fanmail.biz forum and found it to be a very useful place to send letters to celebrities. However, I am still quite confused about the specific process. I would like to ask: How to write an impressive fanmail letter that has a high chance of getting a response? In addition, how should I prepare to send a photo for an autograph, do I need to send a stamped envelope? I plan to send a letter to a Hollywood actor, so are there any special notes when sending internationally? I hope to receive experiences from those who have sent and received feedback.
Thank you very much!
My photo: http://surfmypictures.com/image/e34837e ... 3kv4j.html