Day 95: Write a very brief letter to the agent.

"Include the one-paragraph description of your novel that you wrote earlier. And include one brief paragraph about yourself. Do sound professional. Do not say, “I always wanted to be a writer . . .” or “I can write better than the junk I see . . .”
If you are sending your manuscript to more than one agent at the same time, you MUST tell them that this is “a multiple submission.” Either an agent will read it quicker or not at all; either way, you'll get an answer sooner.
In the jiffy bag, put A) the fifty pages or so of your novel, B) your letter to the agent, and C) a #10 SASE for the agent's reply. (You will not get the fifty pages back.)"

How do I sound more professional? I'll have to work on it and have someone proofread for me.

Sending manuscript to more than one agent probably is not a very good idea. I did it once, and when I was accepted by one, two others contacted me too. It was not a good experience. I had to apologize to the other two and tried to promise another book. That was not fiction writing though.

5 more days.