When and where did MLK first get to put Gandhi's ideas into practical use?

King didn't find a practical application for how to put it to use until he became involved in the Montgomery bus boycott of 1955 and '56.

Explanation:

In his 1958 book Stride Toward Freedom: The Montgomery Story, King laid out the principles of nonviolence he'd employed during the boycott. He affirmed that it is possible to resist evil without resorting to violence and to oppose evil itself without opposing the people committing evil.

- He saw the legacy of Gandhi's leadership in India To better understand Gandhian principles, King took a one-month trip to India at the beginning of 1959. There, he was pleasantly surprised to find that many people there had followed the nonviolent bus boycott he'd been a part of.