I copy this in a web:The first sentence must get the reader's attention. Asking a question in which the answer is guaranteed to be "yes" is a good way to start. "Would you like to improve your life?" The opening paragraph, in fact the first sentence, should excite curiosity or attract the attention in some way that will make the reader continue to read the letter.
The most difficult paragraph to write in a sales letter is the first one. You have just a few seconds to get the reader's attention.Would you like to see your factory's production increase by 15% or more?Wouldn't you prefer to have your wedding pictures taken by the leader in the field?