Can you get a lawyer to draft a Co-Signed Document?

I want to write a book about a topic I never studied in school and my friend said you will need an educated person to co-sign your book so that you can legally publish on a topic you have no legal expertise in, and I am thinking of getting somebody to help me draft a contract so I can get paid 50% and not be cheated if the book is published under somebody else's name.

Can you get a lawyer to draft a Co-Signed Document?
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