I’ve always thought of u/Ramen_Lord’s ebook as the go-to. Essentially all aspects of ramen making are covered here. If you don’t want to make noodles, just buy chukamen at the store. If you don’t want to spend too much time making broth, make a shoyu ramen. Essentially you can choose to focus on what part of the dish you want to master and then move to the next until you are able to make a whole bowl from scratch (if that’s your goal).
I’m sure JOC’s recipe is great, but since ramen isn’t really a homestyle dish, to me it make sense to learn from a resource that isn’t focused on homestyle Japanese.