The most important is that you, the commanding officer, are a role model for leader development. Next, you should establish a climate that encourages leaders to take risks, grow, and develop on their own initiative. Third, get to know the leaders within your command as individuals with unique skills, abilities, backgrounds, and goals.
Setting the conditions for leader development is merely performing your job in ways that signal leaders and Sailor throughout your command that leader development is highly important. It can have a big impact in return for minimal time and resource investment on your part.