I had a creative writing teacher in high school high school who bragged on my writing and that was the sum total of my experience. That was also the last time I wrote. I chose what I thought at the time was a more practical path and took all the math and science classes that were offered in high school and college. My post grad work was in medicine.
My point is that I didn't write anything other than brief medical notes for 35+ years. I got bored after retirement and finally decided to write. I had no experience and no classes on the subject. I just sat down and started typing and I've written five books (none are exceptionally long, 40-50 thousand words each) in five months. The stories just seem to write themselves. I don't do anything special so I don't know that I can really advise anyone on how to do it. I'm sure if you ask a dozen writers how to write you'd probably get a dozen different answers. I'd suggest that either you or your husband just sit down and try it. You, or he, may be better than you think.
I'll put some thought into it and if I find a better answer to your question I'll post it. Now, if your question is more along the line of how to find a ghost writer? I don't know but I'll research it and, again, if I find a good answer I'll let you know.