I almost write to formula, because there's a historical beginning, then the plots get convoluted.
If you have some natural talent and really want to write, you should read the books of someone who's very successful in your genre. You don't want to plagiarize, but you want to learn from that author.
When I first started writing, I was in advertising at the time, I was doing most of my writing on weekends. I had studied most of the other series heroes and I figured it would be fun for mine to be different and put him in and around water. So I dreamed up Dirk Pitt.
Some people are drawn to a van Gogh or a Rembrandt. Some are attracted to exotic guns. Coins. Stamps. I am attracted to cars.
When we find a ship, we turn it over to the state or federal government. It's purely historical. I've never made a dime on any of it.
The fascination for me is searching the unknown for a mystery.