Well you could have the introduction, which leads into the first verse. Some songs put a chorus at the beginning before the first verse. Then, before you finish the first chorus, you can include a bridge, which is a kind of creative transition where the tone or beat may change before the hook. Honestly, there are so many ways to go when it comes to structuring a song, so don't focus too much on the structure if you're writing music. Instead, focus on the lyrics, notes, and melody and then put it all together in a way that makes sense.