Congratulations! If you made this far, hopefully you are done with your first trailer track sketch!
Exercise time!
Before you start developing your track and to layer your sounds, I suggest using the ideas from this video to organize your project.
The way I group and organize is not a must, but if you don't have a different idea, you should start with this. Organizing and grouping properly will save you a lot of time and effort, so it is worth dedicating 10-15 minutes to this task!