Your font needs to be easy to read, and use bold fonts and italics sparingly throughout the manuscript.
Your work is automatically copyrighted as yours the minute you write it.
Don’t try to make your own cover, spend your time on the words. A marketing team will handle the cover once the publishers actually decide to publish your book.
Cover letters are essential.
The cover letter has to be professional, concise, and free of spelling and grammatical errors, make clear why your book is saleable and important, include a 1-2 line pitch. The synopsis has to be clear and enticing, include all key plot points (even the ending).
Read and edit the book before you submit it.