Welcome - reading is as important as contributing on Medium, because you want to build up a community of people who you follow and who follow you.

Have a look at some of the publications - Tantalizing Tales for 1 (I'm editor there and Jordan & Lucy write for us)

See what they like, check out their submission guidelines, because publishing through them will definitely get you extra readers, because people follow publications & publications often promote (via Twitter)

Clap when you like something - 50 claps is the max and you can give it every time you like a story, it costs you nothing, and helps the story become visible.

Good Luck