Every option has its pro’s and con’s. Regardless you have to pick a database, learn the API interface and set it up. After a while…
I have been working on a Java API Framework called light-4j. I encourage you to take a look at it. It is an amazing open source framework for creating API microservices.
“All things are created twice; first mentally; then physically. The key to creativity is to begin with the end in mind, with a vision and a blueprint of the desired result.” ― Stephen Covey