Semi-formal E-mail asking

Dear Mr. Brown,

I read your advertisement for learning to sail and I am very interested in joining to the class. However, I would like to ask you a few questions about it.[A1] 

First of all, when exactly it is? Also, how much does it the class cost? Secondly, your ad mentions teaching in small groups and I would like to know the number of people in each group. Besides I need information about the types of accommodation and other activities. In addition of this, will I need to bring any special clothes or equipment with me?

Finally, mi little sister would like to join in too, but she is only 8. Is she too young to take part pf it?[A2] 

Thank you very much for your time. I look forward to hearing from you.

Kind regards,

David Enriquez.[A3] 

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 [A1]Openning comments, reason for writing

 [A2]What information you would like/your questions

 [A3]Closing comments, kind regards