get one's foot in the floor
Meanings of "get one's foot in the ..."
To have a chance to do something that could lead to further opportunities;
to complete the first step in a process.
(The phrase is most commonly used to refer to employment.)
Сделать первый шаг к достижению цели. Например: "I was able to get my foot in the door of the baking industry when I found a job at a bank." ("Мне удалось начать свой путь в банковской отрасли, когда я нашел работу в банке.")