Problem:
I need to choose a big-ticket item that is rather complicated, such as a stereo system or a vacation in the Caribbean. Then I need to write a business letter to the company or organization that's offering the item, and ask four questions that are important to you. Be sure to include enough background information, so the reader can answer your questions satisfactorily. This is about writing effective letters to a business.
The questions can be of anything you think a business letter should ask if you wanted to know something. I am not sure how to write an effective business letter, and I don't know what kind of questions that I might want to ask someone at a business if I just wanted know something about a complicated big-ticket item. Help me think of questions and help me by giving me an example of how an effective letter should look like.