Stick to normal font that can be easily read. Don’t use a bold font and use italics sparingly.
Your work is automatically copyrighted as yours the minute you write it.
Do not make your own cover. Spend 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 and include a 1-2 line pitch. The synopsis has to be clear and enticing and all key plot point must be included (even the ending).
Read and edit the book before you submit it.