George Washington didn’t have a ton of military experience when he was named Commander-in-Chief of the Continental Army. But it’s clear that he gave the position a great deal of thought as he made his way from Philadelphia to Boston. When he arrived, he clearly had a lot of ideas about what an army should look like. Furthermore, he had ideas regarding the overall structure of things and the institutions that should be in place.
Shortly after officially taking the position, Washington began petitioning Congress for various titles and positions, and groups. And it appears that Congress recognized that his ideas had merit, because there was very little that they actively turned down. (Obviously, there were some things that they were unable to provide because of shortages here and there, but they were typically behind him.)