Cover Letters, Follow-Ups, Queries and Book Proposals

Once your cover letter is positioned first to be noticed, then how do you position the letters to be noticed for the longest time in a number of situations? What kind of thank-you letters work best?
How do you ask for help in finding a job from a letter to a stranger, acquaintance, or business networking contact? How do you write a cover letter that will never be misinterpreted as a sales pitch or autobiography?
How do you plan, write, and format an outstanding book proposal that lets the reader see the bottom line--profit for the publisher?
Positioning your goal or project first means going where no one has gone before. It's where the competition is missing. Go where no one else has gone before when you plan, write, and format great cover letters, follow-up letters, and book proposals.
Cover and follow-up letters or proposals could be applied to book proposals, book proposal cover letters, written marriage proposals, pre-nuptials, and courting. Cover letters could apply to love letters, letters to friends and relatives, business contacts at trade shows, or literary agents.
How do you use cover and follow-up letters to position first your resumes, proposals, relationship communications, marketing or sales connections and connections?
After cover letters, how to you plan, write, and position first your follow-up letters? What types of letters bring people together? Act as a catalyst? Get you an interview? Position you first for inclusion in a job, business, or relationship?
What type of letters position first, attract, and sell what you can do without looking like sales letters? What types of cover and follow-up letters are best sent with a resume?