Sample chapters need not include the first chapter, and they do not have to be in consecutive order. You may send the second and tenth chapter, for example, if you think they are good indications of what the book as a whole will be like. The manuscript may be only partially finished when you send the two sample chapters or outline, or it may be complete. Either way is fine, but please let us know what stage your writing project is in. Phone queries are welcome.
Simultaneous submissions are permissible.
If you send your manuscript with a return receipt request, you'll know when your manuscript arrives because you will be notified by the post office. It is imperative that you keep a copy of your manuscript just in case it is lost or damaged in the mail. Erasable paper tends to stick together and smudge and so is not acceptable. A margin of one inch or more on both sides of the page should be allowed for editor's notes and corrections. If your manuscript needs to be scanned, do not write on your submission.