One thing to warn you about down the road is that although a memoir is formatted the same as any other manuscript, its query is completely different from anything else.
Assuming you're not famous or anything like that, a memoir has to tell a story that is interesting to the reader, not just the writer. Its query does not resemble a nonfiction proposal, nor can it usually be sold on spec. Its query will read very much like a fiction query, except for it will be in first person. A lot more of it than a fiction query will be in past tense.
You might want to look at some of the queries in the query letter forum of share your work. Queries for memoirs are a lot harder to write than the author tends to envision. By looking at queries early, it will help you focus your book more, and help you think about composing your query as you're writing.
Best of luck,
Jim Clark-Dawe